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ChemistryNEET 2024Nucleophilic substitution: SN1 and SN2

Haloalkanes and Haloarenes

The compound (from the four structures shown) that will undergo the reaction with the fastest rate is:

Question 75 as printed in the NEET 2024 booklet

  1. A.Structure (1)
  2. B.Structure (2)
  3. C.Structure (3)✓
  4. D.Structure (4)

Solution

rate depends on carbocation stability. 1-Bromo-1-phenylethane (3) ionises to a secondary benzylic cation stabilised by resonance with the ring — far more stable than the secondary cyclohexyl (1) or the primary (4) cations; bromobenzene (2) does not undergo at all.

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