Coordination Compounds | Class 12 | Full Chapter

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  • Опубликовано: 30 янв 2025

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  • @selfstudylover786
    @selfstudylover786 Год назад +1043

    This 37 min lecture is better than 4-5 hours lectures....😀
    Super explanations 👍
    Thanks a million ❤

  • @misbahnaik4987
    @misbahnaik4987 11 месяцев назад +192

    Being a teacher myself, you are straight to the point making the topic crisp, concise and talking only what's important.
    Much appreciated 👍🎉

  • @Mahemaithili
    @Mahemaithili 8 месяцев назад +187

    0:08 BASIC INTRODUCTION
    4:32 Werners theory
    7:25 Calculation of primary and secondery valancey
    9:31 structure of werners theory
    13:20 type of ligads
    16:46 Nomeclature
    25:08 CFT
    33:40 trick to find hybridisation and vbt
    37:48 end ....🎉🎉🎉

    • @LOKESH-0069
      @LOKESH-0069 6 месяцев назад +4

      ❤ thanks 👍🏻

    • @shubham_gupta9
      @shubham_gupta9 6 месяцев назад +2

      Thnx

    • @Hustlebox75
      @Hustlebox75 6 месяцев назад

      Thanks ❤ literally I was searching for this

    • @reelvideos9780
      @reelvideos9780 4 месяца назад

      thank u

    • @Art_hub66
      @Art_hub66 Месяц назад

      Ye description me diya hota hai key concept 🤡🤡

  • @raowaseemchemisto3974
    @raowaseemchemisto3974 2 года назад +297

    Amazing Sir Amazing.
    For a Beginner it is a million dollar video.
    Love from a Chemistry Lecturer.

    • @NAJAMACADEMY
      @NAJAMACADEMY  2 года назад +59

      Thank you, Sir!!!
      It motivates us a lot to get honest appreciation from great people like you.💗🤲

    • @making_magic_
      @making_magic_ Год назад +4

      sir please provide pdf of this lecture 🙏
      @@NAJAMACADEMY

    • @RoqaiyyaKhatoon
      @RoqaiyyaKhatoon 7 месяцев назад +3

      U are a lecturer 😂😂😂 see in secondary valency something is wrong
      I am a student 😊

    • @Pbgeeta
      @Pbgeeta 3 месяца назад +1

      Plz cover full chapter of 12 chemistry ​@@NAJAMACADEMY

  • @konidelapurnima
    @konidelapurnima 2 года назад +113

    I literally watched many lectures of this lesson but I didn't understand.. But this plat form is really worthable sir.. Thank u so much sir.. We want many chapters forward..

  • @vegzjoh-dn9pf
    @vegzjoh-dn9pf Год назад +197

    I'm from Tanzania 🇹🇿. I sincerely appreciate what you're doing sir. You have helped me a lot in chemistry. Thank you

    • @noneedtosub
      @noneedtosub Год назад +6

      What grade are you?

    • @Chillacat
      @Chillacat Год назад +3

      @@noneedtosub yeah which grade r u
      I am from 🇹🇿 Tanzania too

    • @Chillacat
      @Chillacat Год назад +3

      Bro i am from Tanzania 🇹🇿 which grade r u

    • @srinithijasivakumar543
      @srinithijasivakumar543 Год назад +1

      Th😮

    • @video156
      @video156 9 месяцев назад +3

      I am from India

  • @puchki141
    @puchki141 16 дней назад +51

    anyone in 2025?

  • @ashwinipatil1261
    @ashwinipatil1261 Год назад +18

    TBH this is soo much better then that 3-4 hours of lecture, I was struggling with nomenclature when I read it from book then I watched this and it seems soo easy now ❤thank you sir ❤

  • @NilanjanaMajumder-n1b
    @NilanjanaMajumder-n1b 2 месяца назад +6

    Best lecture I have ever seen.....jo chiz 2-3 hrs ki lecture kar nhi saka yo 37 mins ki lecture ne kar dikhai....it is very helpful...keep providing us with such content.❤

  • @Northeastregion
    @Northeastregion 2 года назад +27

    This is the chapter i was searching in your channel but now luckily I got your simple explanation here today i have class test
    ....no words to thanks from my side sir 💚💚💚

  • @VSCPR-i9l
    @VSCPR-i9l Год назад +97

    CORRECTION : In secondary valances are satisfied by neutral molecules or -ve ions (PIN MY COMMENT SO EVERYONE CAN SEE THE MISTAKE AND CORRECT IT)

  • @robertsonsofficial7245
    @robertsonsofficial7245 2 года назад +396

    Sir I kindly request you to upload the full video of ORGANIC CHEMISTRY FOR CLASS 12 NCERT🙏🙏

    • @NAJAMACADEMY
      @NAJAMACADEMY  2 года назад +147

      We will try our best 🙏👍💗💞

    • @sivabalan8870
      @sivabalan8870 2 года назад +23

      Why fair when najam sir is here

    • @googlesri9406
      @googlesri9406 2 года назад +18

      Yes !! We want full chapter.

    • @googlesri9406
      @googlesri9406 2 года назад +10

      @@NAJAMACADEMY thank you for this video 🙏

    • @itsayush4005
      @itsayush4005 2 года назад +9

      It's hard to cover whole organic chemistry in one video 🙃

  • @Tbdiyisreal
    @Tbdiyisreal Год назад +16

    I have seen many lectures of coordination compounds but I used to get bored and I used to quit the lecture but not this time this video is amazing 3 to 4 hours of lecture in 37 minutes 🎉🎉❤

    • @SuryatheGreat
      @SuryatheGreat Год назад +1

      Exactly... Doubts still used to come up after watching such long videos... But this small video left no doubts in me 😃😃

  • @gunashreemr
    @gunashreemr Год назад +10

    Sir you are really a god for me🙏🙏🙏 who helped me understand 1st pu organic chemistry chapter just a day before exam. I feel blessed to listen to your teachings. Please continue helping in 2nd pu also sir I will be really thankful for you. I also request you to upload all the chapters concept of both 1st and 2nd pu with basic which will help me a lot not just in boards but also in competitive exam🙏😊🙏

  • @Surya5103
    @Surya5103 День назад +1

    This is more helpful than 5-6 hours lecture in RUclips industry😅❤

  • @CHARAN17275
    @CHARAN17275 Год назад +37

    This 38 min is >>>>>>> All one shot ( long hours videos named as shots)😅 Thank you ❤️ So Much Sir 😊

  • @shaikhsameera2074
    @shaikhsameera2074 2 года назад +25

    It has been a best video of the day....there no timepass in this lect and i understood it very well..thankyou so much sirr🙂🤝

  • @tajubdi9481
    @tajubdi9481 2 года назад +6

    Literally i scrolled and watch maximum video's of others but ... This method is so good...so easy to understand...

  • @studentofengineering-sp3si
    @studentofengineering-sp3si Год назад +35

    how many happy indians

  • @darkfacts5154
    @darkfacts5154 11 месяцев назад +41

    Frist time as a indian to thank a pakstiani thank you ....sir

  • @Anaya_singh07
    @Anaya_singh07 Год назад +28

    bro am i dreaming ????? i completed the whole 3 hour chapter in 30 mins because of you. thanks to u :)

    • @unconsciousharsh
      @unconsciousharsh 3 месяца назад +3

      Yes you're in dream so that you couldn't realise bro skiped isomerism

    • @1ซู
      @1ซู 3 месяца назад +1

      ​@@unconsciousharsh yea he is 😂

  • @bhavyasri6364
    @bhavyasri6364 Год назад +6

    Ur the person with lots of talent sir... literally i am unable to see long vedios for 3to4 hrs .....by this am completing very easily within in less tym fr my kcet.....thanku gentleman 🎉❤

  • @Naveen-230
    @Naveen-230 Год назад +2

    According to wener's ( warners) the primary valency are satisfied by negative ions and the secondary valency are satisfied by netural or negative ions or ( sometimes by cationic species - discovered later )

  • @anosvoldigoad4112
    @anosvoldigoad4112 11 месяцев назад +4

    23:39 u told us than if only there is a negative sign in the Coordination sphere then it will end with the suffix "ate" but in the second given compound it has positive sign and u have given it us nitrate. If i am wrong please correct me

    • @NAJAMACADEMY
      @NAJAMACADEMY  11 месяцев назад +2

      It's name is nitrate...
      That's why I write it nitrate...

    • @M.V.Manogna
      @M.V.Manogna 9 месяцев назад +3

      Small correction,
      We have to add suffix with 'ate' when the whole compound is negative but not only if the coordination sphere is negative.
      Here the whole compound is neutral, so there is no need of adding suffix and also the name itself is a nitrate and thus the name is written nitrate.
      This is my understanding.
      Correct me if I am wrong.

    • @ManikVelan-mr5jd
      @ManikVelan-mr5jd 9 месяцев назад +2

      ​​@@M.V.Manogna, yes you're right. We see formalities only for the ligands attached to the central atom. Not to the counter ion

    • @M.V.Manogna
      @M.V.Manogna 9 месяцев назад

      @@ManikVelan-mr5jd Yes👍

  • @bible_message2188
    @bible_message2188 2 года назад +3

    Jo bhi lecture ko dekhne mai doubt karrha hai ki ye dekhna chahiye ki nhi so bhai full guarantee hai ye lecture kafi hai bhai chaper khatam karne liye ❣️🥳🤯

  • @pavithraraju2040
    @pavithraraju2040 Год назад +49

    Sir I'm from Tamil Nadu...ur lectures are so awesome! I really thankful for u...plss do more videos for NEET 2023...

  • @Shraddhx_shettyzz
    @Shraddhx_shettyzz 3 месяца назад +2

    I'm from Karnataka.. sir your videos really helped me a lot in 1st puc and now i continue to see you videos.. It is short and crisp.. Thank you sir for your efforts..🙏❤️

  • @ATSC936UP
    @ATSC936UP 11 месяцев назад +1

    35:06 I like your method most because I have an Interest in Police/Civil lines and also in learning short forms
    Here DSP means Deputy Superintendent of Police means third level of District Police charge.

  • @Shespeaks_77
    @Shespeaks_77 4 месяца назад +3

    Best one shot before exam!! ❤
    37 mins really worth it!!!!!!😊

  • @BumuSingh
    @BumuSingh 11 месяцев назад +4

    19:44 it should be ammine (it's an exception)
    Eventually awesome explanation sir lyk just dharmaculous explanation!!❤️❤️❤️

  • @labeebartaza-7340
    @labeebartaza-7340 Год назад +5

    NAJAM ACADEMY! Ek he toh dil hae kitni baar jeeto gae. ❤️👍🏽

  • @beinglavanya
    @beinglavanya 4 месяца назад +2

    37:48 here u made a mistake ....u should write Cl not CN....but whole videos is superb and animation is next level👌👌👌👌👌👌👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻

    • @Arashi_Man
      @Arashi_Man 3 месяца назад

      What do you mean????!

  • @BhaveshSankhala-el4fw
    @BhaveshSankhala-el4fw 11 месяцев назад +3

    This is like a dream come true!! i.e. Najam Academy uploading full lecture video of a chapter ❤

  • @yaswanth6178
    @yaswanth6178 Год назад +620

    2024 attendence here!

  • @saurabhkumarchauhan9525
    @saurabhkumarchauhan9525 Год назад +4

    One of the best Chemistry channel ... thankyou sir for such awesome explanation and notes🙏❤️

  • @sahasramothkuri4944
    @sahasramothkuri4944 9 месяцев назад +11

    This is what I need 'PRACTICAL TEACHING'.. How many will obey..?

  • @harnoorkamboj7588
    @harnoorkamboj7588 4 месяца назад +1

    God bless such a soul.....Thank you so much for teaching in a simple, clear and precise way. As a first year engineering student....I needed to brush up my old concepts and this video is perfect!!

  • @kunzanglhamo5649
    @kunzanglhamo5649 Год назад +5

    Its 12:50 am.. and i have my finals tomorrow... Thank u so much for such a short yet effective explanation❤

    • @shrish19
      @shrish19 Год назад

      Kitne aaye bhai??

  • @iamritikmaan
    @iamritikmaan 4 месяца назад +27

    full chapter ❌ full chapter except isomerism ✔

  • @mohorghosh06
    @mohorghosh06 Год назад +4

    This person teaches the hardest parts in the easiest ways. Kudos 👏

  • @ShagunSingh-fd6wc
    @ShagunSingh-fd6wc 4 месяца назад +2

    To be very honest it's the best video for coordination compounds🙌

  • @Charangeet
    @Charangeet 11 месяцев назад +2

    8:03 correction there would be -1 instead of the +1

  • @dhanyashri266
    @dhanyashri266 4 месяца назад +3

    He missed isomerism and colour coordination,and two more last topics kindly dont miss them i think for the first two he have uploaded vedios but others kindly check them out and complete your lessons fully😊❤️

  • @Jade_jeremy-10
    @Jade_jeremy-10 2 дня назад +1

    Nice class easy to learn and understand ❤❤

  • @tobiramasenju495
    @tobiramasenju495 2 года назад +18

    BRO .. I AM FROM INDIA .. U MUST KNOW THAT U R REALLY HELpING us .. to love chemistry .. in INDIA
    Chemistry is comsidered boring subject i hope in future u may help our cbse 12th and 11th chemistry full syllabus to visulaise concept .. love from india

    • @haruki_6461
      @haruki_6461 Год назад +3

      I think he is also from India.

    • @TUSHARX009
      @TUSHARX009 8 месяцев назад

      He is Indian, but not from India​@@haruki_6461

  • @MehvishFatema026
    @MehvishFatema026 10 месяцев назад +1

    One of the best lecture I have ever seen
    Thank you so much sir
    Sir you deserve millions of subscribers seriously
    Jazakallah

  • @Solo0221
    @Solo0221 4 месяца назад +2

    BEST CHANNEL FOR STUDY ❤

  • @srishtibanwari
    @srishtibanwari 2 года назад +8

    Please upload all chapters videoes of Class 12 Chemistry
    Chapter 1 The Solid State
    Chapter 2 Solutions
    Chapter 3 Electro chemistry
    Chapter 4 Chemical Kinetics
    Chapter 5 Surface Chemistry
    Chapter 6 General Principles and Processes of Isolation of Elements
    Chapter 7 The p Block Elements
    Chapter 8 The d and f Block Elements
    Chapter 9 Coordination Compounds
    Chapter 10 Haloalkanes and Haloarenes
    Chapter 11 Alcohols Phenols and Ethers
    Chapter 12 Aldehydes Ketones and Carboxylic Acids
    Chapter 13 Amines
    Chapter 14 Biomolecules
    Chapter 15 Polymers
    Chapter 16 Chemistry in Everyday Life

    • @NAJAMACADEMY
      @NAJAMACADEMY  2 года назад +5

      I try my best to upload all these chapters...
      💗💗

    • @srishtibanwari
      @srishtibanwari 2 года назад +1

      @@NAJAMACADEMY thankyou sir 😊

  • @adithiyaa409
    @adithiyaa409 2 месяца назад +1

    very clear and easy way of teaching concepts 👋👋

  • @kailashtd1460
    @kailashtd1460 2 года назад +1

    BROOOOOOOOO UR ULTIMATE BRO JUST IN 40 MINS COMPARED WITH OTHERSS🤯

  • @NirmalSura-u4m
    @NirmalSura-u4m 3 месяца назад +15

    No isomerism topic
    No double Salt topic
    No application of complex compound
    😂😂😂
    But better than 4-5 hours lecture

  • @dinish3518
    @dinish3518 2 года назад +2

    to find no of electrons , why we are subtracting 18 (Co= 27- oxi state-18) 34:24
    can we use that for all d-block elements
    pls reply sir

    • @mithranninja5257
      @mithranninja5257 2 года назад +1

      18, we subtract Argon. Or you can write [Ar]

  • @AnkitaRai-mt4pn
    @AnkitaRai-mt4pn 6 месяцев назад +3

    Why we should watch that shit 4-5 hrs lectures you are such a ligend means you made us believe we can practise chemistry in an interesting way❤

  • @yashaswinim763
    @yashaswinim763 Год назад +2

    i was so confused with this chapter or neet but then u saved my life🙏🙏

  • @Tzulyne
    @Tzulyne Год назад +2

    Thank you sir🙏
    All my doubts in this chapter are clear now
    I'm so grateful 🙏

  • @PriyanshuRajmain
    @PriyanshuRajmain 9 месяцев назад +26

    Neet 2024 aspirants attendence here

    • @Thansi_2430
      @Thansi_2430 9 месяцев назад +1

      This is enough for neet? Plss tell me

    • @PriyanshuRajmain
      @PriyanshuRajmain 9 месяцев назад +2

      ​@@Thansi_2430this is not enough for neet you have to get more information

  • @calmharmonyhub-gk4ft
    @calmharmonyhub-gk4ft 11 месяцев назад

    I think he is the best teacher in the world ❤ bcho ko samjh se jada samjhne wale matter krte

  • @icbgaming888
    @icbgaming888 4 месяца назад +3

    Sir its cobalt not cobolt 24:43

  • @rmi8200
    @rmi8200 2 года назад +6

    we need this type of explanation....

  • @Islamic_daughter
    @Islamic_daughter Год назад +12

    20:12 not CN but its Cl ❤

  • @shreya3351
    @shreya3351 2 года назад +2

    Im so glad to know that you have uploaded video of this chp.
    Tysm sir.

  • @prasanthipushadapu9413
    @prasanthipushadapu9413 7 месяцев назад +1

    Good Explanation sir ,, After listening, I have no doubts about this chapter Thank you very much ☺️😊😊

  • @Study-g2k
    @Study-g2k Месяц назад +1

    34:03 is the "-18-charge" always true?

  • @madhavgupta9485
    @madhavgupta9485 Год назад +2

    I understood CFT now properly 😍👍

  • @aaryanegp6959
    @aaryanegp6959 4 месяца назад

    Damn, I usually don’t comment on any videos but the crystal clear clarity of your content and your hard work made me change my habit ❤❤😊

  • @artventurebytushar
    @artventurebytushar 2 года назад +6

    Please also upload a lecture on chemical bonding and molecular structure class 11

    • @NAJAMACADEMY
      @NAJAMACADEMY  2 года назад +2

      We will try our best..👍💗

  • @sivaparvathigudapati9134
    @sivaparvathigudapati9134 7 месяцев назад +1

    Thanks for your great explanation you said better than my teachers 😢❤❤

  • @pringles3065
    @pringles3065 6 месяцев назад +1

    Charan Sparsh sir...Bahut bahut dhanyawad 🙏🙏🌅

  • @alluraiahpolisetty8862
    @alluraiahpolisetty8862 12 дней назад

    Waiting for 1 million subscribers 🎉🎉😊

  • @n.bhuvaneshwarbhuvan4455
    @n.bhuvaneshwarbhuvan4455 2 года назад +2

    In one day i understand clearly sir tqsm sir ✨✨❤

  • @tutorkhan2492
    @tutorkhan2492 4 месяца назад

    Best video ever about complexes.Excellent❤❤❤❤

  • @ThebrutalYT
    @ThebrutalYT Месяц назад +9

    Anyone before 2 months of exam 😅

  • @A.A.J.10
    @A.A.J.10 Год назад +1

    Bro literally i saw a great chemistry teacher after my coaching sir❤

  • @SquidTone
    @SquidTone Год назад +1

    Awsome explanation and I give 1 like this video because he was explain with basic concepts ❤

  • @SwarnalakshmiLJ
    @SwarnalakshmiLJ Месяц назад +1

    Pls make one shot for other chaps too sir! We request you😢

  • @anushakonuri3499
    @anushakonuri3499 Месяц назад +2

    It use full for jee mains sir

  • @aditiraj7219
    @aditiraj7219 5 месяцев назад +1

    Like to bnta hai...literally mera bhout dimag kharab hua tha uff ye chapter...now all good thank u so much ❤

  • @studentofengineering-sp3si
    @studentofengineering-sp3si Год назад

    sir here in hexaflouroferrate(II)ion as per rule we should move from left to right but we are moving opposite to it ..\
    i not blaming just informing and heart full of thanks to you for taking such a mindblowing session

  • @bbgsof_xx
    @bbgsof_xx Год назад +1

    Woww Amazing Explanation Sir🔥🔥🔥

  • @vishnupillai884
    @vishnupillai884 2 месяца назад

    Sir please make more videos like this on chemistry it's very understandable and saves time

  • @ruunyx
    @ruunyx 8 месяцев назад

    Sir, please upload this one shot videos for all the chapters, it would be really useful 🙏

  • @Sandeep77798
    @Sandeep77798 Год назад

    Thanks sir aap jo ase short notes bana ke batate hai revision ke liye bahut achha hai

  • @studytime444
    @studytime444 2 года назад +3

    Sir kindly request you to make more videos like this chapters 🙏🙏🙏🙏🙏🙏🙏

  • @SaiDeepika-n8x
    @SaiDeepika-n8x 2 месяца назад +31

    2 mins silence for all those who are hearing the chapter for first time and believes that they can do jee mains questions 💀

    • @Farhan47x
      @Farhan47x 11 дней назад

      Nobody thinks that except you

    • @SaiDeepika-n8x
      @SaiDeepika-n8x 11 дней назад

      @Farhan47x ok bro

    • @JeeAdvanced-s8c
      @JeeAdvanced-s8c 9 дней назад +1

      Bhai aaj hai first day first show

    • @SaiDeepika-n8x
      @SaiDeepika-n8x 9 дней назад +1

      @@JeeAdvanced-s8c paper kaisa Gaya bhai? Sab teek hai na

    • @JumnaStudyfr
      @JumnaStudyfr 8 дней назад

      Not cool if someone is doing that

  • @sritamilgamer4094
    @sritamilgamer4094 21 день назад +1

    Sir came back for this video for revision guys any question can be solved by najam sir tricks 😊

  • @tanujabhatt699
    @tanujabhatt699 Год назад

    Last year i was depressed by seeing all videos then i found this channel 2 days before my exam and in 2 days i just remembered all syllabus of whole semester 😂😂
    My friend think i will never paas exam but its all opposite 😂
    Now i have a exam on 30
    Here i am
    This channel is just magic fir me ❤❤

  • @BaljeetMeet
    @BaljeetMeet Год назад

    Sir mujhe apka pdane ka treeka bhut acha lga.aur mujhe smjh bhi bhut ache se aaya.thank you sir.

  • @mohanvams
    @mohanvams 9 месяцев назад

    Sir , there was a mistake in nomenclature of coordination compounds at 20mins : 9 seconds....You had written CN in place of Chlorine

  • @erenyeager17735
    @erenyeager17735 2 месяца назад

    13:00
    Types of ligand

  • @Bharat_Rana89
    @Bharat_Rana89 14 дней назад

    ❤thank you sir. Bhut achha pdhate ho aap

  • @sivabalan8870
    @sivabalan8870 2 года назад +7

    With help of you.
    I score 96 in 11th chemistry
    .
    Pls help me 12th

    • @NAJAMACADEMY
      @NAJAMACADEMY  2 года назад +6

      Congratulations 🎊 👏 💐
      Best of luck!!!
      👍💓💕

    • @nipunlambaxl-b257
      @nipunlambaxl-b257 2 года назад +1

      @@NAJAMACADEMY pls also upload coordination compound isomerism

  • @M.V.Manogna
    @M.V.Manogna 9 месяцев назад +1

    09:55 Why did you draw 6 lines for cobalt ? What is octahedral structure ?

    • @ishdiries234
      @ishdiries234 4 месяца назад

      Same doubt pls clear

    • @rajyalakshmikaveti5805
      @rajyalakshmikaveti5805 4 месяца назад

      Read ncert class 12th part 1 chemistry textbook page number 122 fig-5.1

  • @aparaajita4281
    @aparaajita4281 7 месяцев назад

    This helped me study this chapter with so much ease, thank you so much sir ❤

  • @tiaaraguptaa
    @tiaaraguptaa Год назад

    thankyou so much for this!!! surely one of the best lectures on youtube that wastes absolutely no time!! very helpful for revision 💛

  • @Ketchup-l9c
    @Ketchup-l9c 11 месяцев назад +2

    35:07 Sir according to google [NH3] is weak ligand.... soo much confusion please help

    • @aaqibmalla5749
      @aaqibmalla5749 11 месяцев назад +1

      Bro exception is the another name of chemistry it depends on CMA and oxidation state further details Google sai loo ....

  • @shivanshusingh5578
    @shivanshusingh5578 2 года назад

    Sir U don't know
    What you are😮😮Amazing explanation cleared my each n every doubt from this topic.

  • @ZainMughal-v3h
    @ZainMughal-v3h Год назад

    You teaching skills help us to understand better without any borimg

  • @jyothikalvog9037
    @jyothikalvog9037 Год назад

    One of the amazing explanations for complex compounds. It would really help me out!!Thankyou sir.

  • @suyog7531
    @suyog7531 Год назад

    simplest explanation of chemistry i have ever seen.... thank you so much sirrrrr....🥰🥰🥰