NEET 2024 · ChemistryPrevious Year Question
The compound that will undergo reaction with the fastest rate is
Answer: (C) (C) (1-bromoethylbenzene). rate is governed by the stability of the carbocation formed.
- A.(A) cyclohexyl bromide (bromocyclohexane)
- B.(B) bromobenzene
- C.(C) (1-bromoethylbenzene)✓
- D.(D) cyclohexylmethyl bromide ()
Correct Answer
(C) (C) (1-bromoethylbenzene)
Solution & Explanation
rate is governed by the stability of the carbocation formed. ionises to a benzylic (secondary) carbocation that is resonance-stabilised by the aromatic ring, making it the fastest. Bromobenzene (aryl halide) cannot form a phenyl cation, cyclohexyl bromide gives an unstabilised secondary cation, and cyclohexylmethyl bromide is a primary halide giving an unstable primary cation.
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