Instead of paying high fees to colleges we should support these types of channels and teachers. Government should take immediate action on education system as we have to rely on RUclips for education and paying unnecessarily to colleges.
I don't think I'm that much expert, just trying to give something. Thank You for the appreciation. Keep Watching and Share the Video Link with your friends and help us to spread the knowledge.
Instead of paying high fees to colleges we should support these types of channels and teachers. Government should take immediate action on education system as we have to rely on RUclips for education and paying unnecessarily to colleges.
Thanks for this video Sir. Around 10:11 when you were giving examples of compounds that posses n- sigma star transition, u said ketones &aldehydes. The compounds that undergo this transition are saturated compounds with heteroatoms. I got confused bcos aldehydes and ketones posses unsaturated Carbonyl functional group C=O making them unsaturated compounds. So how can they undergo such transition. Was thinking they would only undergo n-π*
sir ur explanation is great.I'm sy bec student.I want to clear net in first attempt so how much I will give for bec and how much for net prep?& which refrance book I Star my net prep?sir you have been done phd so plz Gide me
Sir please please bta dijia ga pls k benzene displays three absorption band at different wavelength full explanations ye to pta h conjugation ki waja se h lakin conjugation kis tarha krti h help me sir
@@pkclasses100 I read a book recently that mentioned this type of transition, sigma-pi star and the author says it appears in carbonyl compounds. The book is Introduction to Spectroscopy from Pavia, fifth edition, may be you could check it.
In UV-Visible spectroscopy, the electronic transition sigma to the pi star may occur. These transitions were observed in the carbonyl compound. But, pi to sigma star does not take place. To understand this, you have to look out the electronic energy levels and transitions occurred in UV-Visible spectroscopy very carefully. (Refer Pavia, Introduction to Spectroscopy, Topic: Ultraviolet spectroscopy). Within the molecule, if sigma molecular orbital present, the electronic transition sigma to sigma star will occur. Now, the molecule containing sigma and pi molecular orbital (i. e. molecule with carbonyl functional group), the sigma to sigma star transition, pi to pi star transition, sigma to pi star transition will occur. As the energy difference between sigma to sigma star transition is large, so sigma to pi star transition will possible to occur. But, if you look out for pi, it will cause pi to pi star transition. There is also an energy difference in between pi star and sigma star levels. (Kindly look electronic energy levels and transitions occurred in UV-Visible spectroscopy) . You have to understand sigma and pi molecular orbitals. The pi molecular orbital is at its ground state will be considered as stable which also known as Highest occupied molecular orbital (HOMO). When the molecule impinges with UV-Visible radiations, the outer electron in orbit will absorb energy as it gets excited to higher electronic transition state which is pi star. i.e. lowest unoccupied molecular orbital (LUMO). As there is energy difference in between pi star and sigma star. The pi to sigma star transition will not possible and occur within molecule.
sir,if we can't measure UV - visible spectra less than 200nm,how we know that sigma to sigma* is below 200nm?&is energy and wave length is releted to each other?
Consider Example of Aldehyde and Ketone under n-π* at around 9.20 min.
Sir that means aldehyde and ketones are not example of n- sgma star..???
@@rashmishukla6864 Yes
Instead of paying high fees to colleges we should support these types of channels and teachers. Government should take immediate action on education system as we have to rely on RUclips for education and paying unnecessarily to colleges.
At 6:24, Consider Energy as Wavelength.
Perfect teacher and expert of spectra
I don't think I'm that much expert, just trying to give something.
Thank You for the appreciation.
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Thnx .Sure sir
important content before exam preperation
INTERNATIONAL INSTITUTE OF PHARMACEUTICAL Science, SONEPAT, Haryana were incapable of teaching, so they send us your videos for understanding. 🔥🔥👍
Same case with my college
Instead of paying high fees to colleges we should support these types of channels and teachers. Government should take immediate action on education system as we have to rely on RUclips for education and paying unnecessarily to colleges.
Sir u have saved my semester exam
I really like the video and content . great job sir .
Nice way of teaching.
Thnku for this concept sir
Welcome!!!!!!!
Keep Watching and Share the Video Link with your friends and help us to spread the knowledge.,
Great lecture ....thanku sir
Informative contents!
Very nice explanation.....thanku sir 😊
Thank you for the appreciation.
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arati maurya 😩😩
Well taught sir👌👌
Nice sir u have a best knowladge
Thank you for the appreciation.
I have very little knowledge, which I'm trying to spread.
Watch UV Vis Spectroscopy in Hindi on "BaaYo" Channel.
Very nice description sir
Yogendra Singh
Thank You for the appreciation.
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Dr. Puspendra Classes yeah sure plss keep continue uploading more videos by serial number
Yogendra Singh
Definitely you will get videos in a proper sequence.
Nice class. Thank you☺
You are great sir😀
Appreciate yr work sir... Thankyou
Thank you sir for great teaching..
Sir can you explain the types of bands.. and how we categories them..In transition
Mainly 4 bands are present in UV-Visible Spectroscopy I.e. K, R, E and B; I will upload a video on those bands very soon.
Thanks for teaching sir
Thanks for this video Sir. Around 10:11 when you were giving examples of compounds that posses n- sigma star transition, u said ketones &aldehydes. The compounds that undergo this transition are saturated compounds with heteroatoms. I got confused bcos aldehydes and ketones posses unsaturated Carbonyl functional group C=O making them unsaturated compounds. So how can they undergo such transition. Was thinking they would only undergo n-π*
Yes Aldehyde and Ketones should be considered in n-π*. You are correct.
By mistake it was written under that section.
Whao, Okay Sir. I was not expecting your reply anytime soon. Thanks for replying this early Sir
@@Oluwasefunmi_Peace 🙏🙂 Trying to reply each and every comment.
But oxygen contain lone pair which is non bonded ...so it can show both (n sigma *)and (n pie*)...?????
thank you thank you thank you❤
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Dr. Puspendra Classes i've shared with atleast 10 friends😊
thanku sir it helped a lot
nc effort👍🏻
Bharti Yadav
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Saturated compound w alcohol group.u means cyclohexanol?? Since it is saturated
which book shoud we use for spectroscopy
Pavia
Sir live class time btaiye
v nice
Nicee sirr 🙏🙏🙏🙏
Sir in n- sigma star energy required 175nm then for water and CH3 how does this n-sigma star can occur ??at 10:5
Thank you sir...
Thank You.
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Thank u sir
Good
Why n to pie star transition is called as forbidden transition
Nice
sir solve this please
lemda value for conjugated and non conjugated compounds
What about ester group? It is n to sigma star or n to pie star?
sir ur explanation is great.I'm sy bec student.I want to clear net in first attempt so how much I will give for bec and how much for net prep?& which refrance book I Star my net prep?sir you have been done phd so plz Gide me
Sir plzzzzz make a complete practical based. Principle video of UV spectroscopy plzzz sir.. Yhaa p mujhe bilcul clear ni hua kuchhh😢😢😢😢😢😢
Lovepreet Kaur
Already uploaded 8 videos in UV, Please watch all the videos for better understanding. Available in my UV-Visible playlist.
Thank You
love frm pakistan..❤❤
Sir plz explain derivative spectroscopy
Sir in the graph there is possibility of many peak.......so why we consider only maximum lambda value??
Sir please please bta dijia ga pls k benzene displays three absorption band at different wavelength full explanations ye to pta h conjugation ki waja se h lakin conjugation kis tarha krti h help me sir
Thanku sir
Welcome.
Keep Watching and Share the Video Link with your friends and help us to spread the knowledge.
Sir can you please provide notes of this chapter
Sorry I don't provide notes.
Resound getting sir
Sir homo lumo ki significance nhi smjh aai ki kese aap do electrons dikha rhe ho niche then upr ik plz reply sir
Can you state that why aldehydes and ketones are taken as example in both n to sigma star and n to pi star transitions??
See the pinned comment
Sir glti kr di ek apne ...energy kam hogi bol k Jada likh rhe h ap
Please see the pinned comments.
At 6:24, Consider Energy as Wavelength.
Sir yadi ham uv me range below 200 rakhte h to ky hoga result ayega ya nhi.???
Nahi aayega.. that will be vacuum UV region and beyond the instrument limit.
Nice lecture, but sir why you are representing energy in nm
Consider Energy as Wavelength, that is written by mistake.
Sir why you didnt mention or take pi-sigma star transition?
That transition is doesn't exist.
@@pkclasses100 I read a book recently that mentioned this type of transition, sigma-pi star and the author says it appears in carbonyl compounds. The book is Introduction to Spectroscopy from Pavia, fifth edition, may be you could check it.
Sir,why transition cannot take place from sigma to pi star and pi to sigma star.
In UV-Visible spectroscopy, the electronic transition sigma to the pi star may occur. These transitions were observed in the carbonyl compound. But, pi to sigma star does not take place.
To understand this, you have to look out the electronic energy levels and transitions occurred in UV-Visible spectroscopy very carefully. (Refer Pavia, Introduction to Spectroscopy, Topic: Ultraviolet spectroscopy).
Within the molecule, if sigma molecular orbital present, the electronic transition sigma to sigma star will occur.
Now, the molecule containing sigma and pi molecular orbital (i. e. molecule with carbonyl functional group), the sigma to sigma star transition, pi to pi star transition, sigma to pi star transition will occur. As the energy difference between sigma to sigma star transition is large, so sigma to pi star transition will possible to occur.
But, if you look out for pi, it will cause pi to pi star transition. There is also an energy difference in between pi star and sigma star levels. (Kindly look electronic energy levels and transitions occurred in UV-Visible spectroscopy) .
You have to understand sigma and pi molecular orbitals.
The pi molecular orbital is at its ground state will be considered as stable which also known as Highest occupied molecular orbital (HOMO). When the molecule impinges with UV-Visible radiations, the outer electron in orbit will absorb energy as it gets excited to higher electronic transition state which is pi star. i.e. lowest unoccupied molecular orbital (LUMO).
As there is energy difference in between pi star and sigma star. The pi to sigma star transition will not possible and occur within molecule.
Sir job lag gae ab kya
Tell me the names of reference book please
Pavia
sir,if we can't measure UV - visible spectra less than 200nm,how we know that sigma to sigma* is below 200nm?&is energy and wave length is releted to each other?
That's why they are UV inactive
there should not be aldehydes and ketones in n-sigma star transition.
Please see the pinned comment.. thank you 😍
Hindii
N➡️sigma*
Water LAMDA max is 191 nm & you are saying 175nm ...which one is ryt sir???
Making confusion...
Dear sir, I need principle of uv in words pls.
Plzzz sir explain in Hindiiii And slowly
Lovepreet Kaur
I will try to make it slow in my upcoming videos. Right now O don't have any plan for hindi videos.
Thank You.
Pls help me sir
Sir Reference to de Diya Kro.
Spectroscopy by Pavia
thank you so much sir
Thank u sir
Thank you sir
Thank you sir