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Mesomerism is extended resonance. Atoms ...

Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw `pi` electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom.

Mesomeric effect stabilizes or destabilizes the conjugate base of an acid. As a result the acid may be strong or weak has 4(OH) groups. Which -OH is a strong acid?

A

S

B

R

C

Q

D

P

Text Solution

Verified by Experts

The correct Answer is:
D
The resulting conjugative base (from P ) is more stable
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Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw pi electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom. Which of the following is most stable?

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