JEE Main Chemistry question

Which of the following structures has resonance stability?

(A)Carboxylic acid (CH₃COOH)Correct
(B)Protonated carbonyl (oxocarbenium-type cation)Correct
(C)Carboxylate anion (CH₃COO⁻)Correct
(D)A simple tertiary carbocation, (CH₃)₃C⁺ (charge stabilised only by hyperconjugation, with no adjacent π-system to delocalise into)

Answer: (A),(B),(C)

Solution

A species shows resonance only when a lone pair, π-bond or charge can be delocalised through a conjugated (adjacent p-orbital) pathway. The carboxylic acid (A), the protonated/oxocarbenium carbonyl (B), and the carboxylate anion (C) each have a charge or lone pair directly conjugated with the

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Question ID VK-139458