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  • Which of the two structures (A) and (B) given below is more stabilised by resonance? Explain.

Which of the two structures (A) and (B) given below is more stabilised by resonance? Explain.

(A)

CH_{3}COOH and 

 

Answers (1)

Structure ‘B’ is more stabilised as it does not involve charge separation.. Hence CH_{3}COO^{-} is more stable.

(A)

CH_{3}COOH 

. Resonance Structures for A (CH?COOH):
- The lone pair on the oxygen in the hydroxyl group can be used to form a double bond with the carbon, resulting in a negative charge on the carbon and a positive charge on the oxygen:
- Structure 1: CH?-C(=O)?-OH?
- Structure 2: CH?-C(=O)-OH (original structure)

Resonance Structures for B (CH?COO?):
- The negative charge on the oxygen can be delocalized between the two oxygen atoms:
- Structure 1: CH?-C(=O)-O?
- Structure 2: CH?-C(−O?)=O (where the negative charge is transferred to the other oxygen)

 

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