NEET 2024 · ChemistryPrevious Year Question
The compound that will undergo SN1 reaction with the fastest rate is:
Answer: (C) (C). \textbf{Answer:} (c) \textbf{Solution:} The rate of an reaction is governed by the stability of the carbocation intermediate.
- A.(A)
- B.(B)
- C.(C)✓
- D.(D)
Correct Answer
(C) (C)
Solution & Explanation
\textbf{Answer:} (c) \textbf{Solution:} The rate of an reaction is governed by the stability of the carbocation intermediate. Structure (C) is a benzylic halide that ionises to a benzylic carbocation, additionally stabilised by an alkyl (methyl) group through resonance delocalisation into the ring plus /hyperconjugation. The aryl halide (B) cannot form a carbocation and does not undergo ; the primary (D) and secondary (A) cations are far less stable. Hence (C) reacts fastest.
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