JEE Main Chemistry question

Statement 1: CH₃⁻ adds to >C=O group irreversibly, but CN⁻ ion adds reversibly. Statement 2: CH₃⁻ ion is a much stronger nucleophile than CN⁻ ion.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

CH₃⁻ (as effectively delivered by a Grignard/organolithium reagent) is a very strong, highly reactive carbanion-type nucleophile; its addition to a carbonyl is thermodynamically very favourable and effectively irreversible under normal conditions. CN⁻ is a comparatively weaker, more stabilized (resonance-delocalized

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Question ID VK-149414