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ChemistryNEET 2025Nucleophilic substitution: SN1 and SN2

Haloalkanes and Haloarenes

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The first compound shown undergoes the reaction faster than the second compound shown.

Reason (R): Iodine is a better leaving group because of its large size.

In the light of the above statements, choose the correct answer from the options given below:

Question 84 as printed in the NEET 2025 booklet

  1. A.Both A and R are true and R is the correct explanation of A✓
  2. B.Both A and R are true but R is not the correct explanation of A
  3. C.A is true but R is false
  4. D.A is false but R is true

Solution

Iodide is the best leaving group among the halides — the large, polarisable ion spreads its charge and is a weak base — so 1-iodobutane reacts faster than 1-chlorobutane in . Both statements are true and R explains A.

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