American CARDIO Trick for Acidic Strength 🔥|| IITian Explained || IIT JEE | NEET
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- Опубликовано: 22 сен 2024
- In general, the strength of an acid in an organic compound is directly proportional to the stability of the acid’s conjugate base. In other words, an acid that has a more stable conjugate base will be more acidic than an acid that has a less stable conjugate base.
Acidic molecules generally have structural features that allow the anion in the conjugate base to delocalize the charge over a larger space. Delocalization of the negative charge (such that one atom doesn’t have to bear the full negative charge) makes the molecule more stable. The most important features that stabilize negative charges include the electronegativity, hybridization, and size of the atom upon which the negative charge is located, the electron-withdrawing effects of neighboring electronegative atoms, and resonance effects.
How atoms affect acid strength
On which atom does the negative charge of the acid’s conjugate base rest? A negative charge prefers to rest on electronegative (electron-loving) elements. Therefore, a negative charge is more stable on oxygen than it is on nitrogen; similarly, a negative charge is more stable on nitrogen than it is on carbon. For that reason, alcohols (R-OH) are more acidic than amines (R-NH2), which in turn are more acidic than alkanes (R-CH3), as shown in the class.
The size of the atom also plays a role in stabilizing the negative charge. Charges prefer to be on larger atoms than on smaller atoms. This preference results from large atoms allowing the negative charge to delocalize over a much larger region of space, instead of being concentrated in a small region (as it would on a small atom). As a rule, atom size trumps electronegativity considerations. So, even though fluorine is a more electronegative atom than iodine, HI is more acidic than HF. The much larger iodine atom allows the negative charge to delocalize over a larger space than does the much smaller fluorine atom, and thus makes hydrogen iodide more acidic. The effect that atom size has on acidity is shown in the class.
How atom hybridization affects acid strength
The orbital on which the lone-pair anion rests also affects the acidity. Lone-pair anions prefer to reside in orbitals that have more s character than p character, because s orbitals are closer to the atom’s nucleus than p orbitals, and the electrons are stabilized by being closer to the nucleus. Orbitals that are sp hybridized have 50 percent s character, orbitals that are sp2 hybridized have 33 percent s character, and orbitals that are sp3 hybridized have 25 percent s character. Therefore, anions prefer to be in orbitals that are sp hybridized over those that are sp2 hybridized orbitals, and they prefer to be in orbitals that are sp2 hybridized over those that are sp3 hybridized. The effect of orbital type on acidity is shown in the class.
How resonance structures affect acid strength
Acids with conjugate bases that allow the negative charge to be delocalized through resonance are stronger acids than acids whose conjugate bases don’t have resonance structures. For example, acetic acid, shown here, is much more acidic than ethanol because the conjugate base anion of acetic acid can delocalize the negative charge through resonance.
Many more such great concepts has been dealt in details in Lecture.
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MKA Sir
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People rarely give credit.. You have my respect ❤️.
Thank you for this trick sir
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Starts from-3:44
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King of chemistry
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I think this was for Boards student , a student who is preparing for JEE would know most of these
thanku so much sir, apki vjah se meri organic bahut improve huyi he
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Haan almost.
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He acknowledged the person who originally came up with this trick. RESPECT.
Sir plzz provide PDF notes also so that we can copy them later
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Basics se hi hoga.
@Animesh Chakrabarti I also wants to start my jee prep after class 12 boards
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RUclips Ki Duniya Mein Chemistry ke sabse Shandar channel
Sir kya avi v acidic strength kii order ko ydd rkhna jaruri hai mera mtlb iss trick ka koi exception to nhi hai naa??
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Thnx sir
Bhayiya one vedio on inorganic chemistry plz
Dher saare aayenge.
Sir 29:40 DNP ke hisaab se florine bromine se zyada powerful toh bromine waala florine zyaada acidic kaise??
plss reply
Thank YOu GURUJI!! LOVED THE VIDEO!! LOVED THE CONTENT!
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AMERICA - CARDIO TRICK
INDIA- OUR BELOVED GURUJI( MKA SIR)....🙏🙏
Thank you so much sir for your help.
Sir love u 3000 times
♥️
Next lecture main acidic our basic strength ka advance level question practice karwana sir plzzzzz🙏🙏🙏🙏🙏🙏
When u open up this super excitedly, but realise at the end that video that u could solve each and every ques on your own and didn't learned even a single new thing....., just wasted 40 min tho.....🥶🥶🥺🥺👿
This also means dear your brain isn’t that much stronger as compared to other students
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Sir dipole induction Mai jo aapne bromine vala example liya thha usme phele case Mai 5 member ring form ho skti hai conjugate base ki . Vo zyda acidic nhi hoga ?
sir maine ajj dhyan se suna aap har 5 sec me ek bar guys bolte ho
Sir benzoic and formic acid mei acidic strength ka reason di jiye please sirr
Btaaya h iska mene previous videos me...Firr bhi ek video bna dunga.
Thank you sir apke wajah se hi maine incho qualify kiya hai
Sir make a video on organic reagents?