Fundamentholfundamenthol
NEET2024Chemistry
Q.

The compound that will undergo S1 reaction with the fastest rate is:

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

Solution

S1 rate is controlled by carbocation stability.

Option 2 generates a benzylic-secondary cation that is resonance-stabilised by the ring, the most stable among the choices. Bromobenzene cannot ionise (no stable aryl cation), and the cyclohexyl options give a primary or secondary alkyl cation without resonance stabilisation.

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