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Topic: Mechanisms of substitution reactions (SN1/SN2)· Organic Compounds Containing Halogens

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : (primary alkyl iodide drawn as zig-zag chain ending in I) undergoes S_N2 reaction faster than (the corresponding alkyl chloride,…

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

Assertion (A) : (primary alkyl iodide drawn as zig-zag chain ending in I) undergoes \(S_N2\) reaction faster than (the corresponding alkyl chloride, zig-zag chain ending in Cl).

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

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

Two skeletal alkyl halides (zig-zag chain with I, and with Cl) in the assertion

1. Both A and R are true and R is the correct explanation of A

2. Both A and R are true but R is not the correct explanation of A

3. A is true but R is false

4. A is false but R is true

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Answer: 1. Both A and R are true and R is the correct explanation of A

Key idea: in \(S_N2\) the rate depends on how easily the leaving group departs.

A is true: the alkyl iodide reacts faster than the chloride. R is true: \(\mathrm{I^-}\) is large and polarisable, the C-I bond is longer and weaker, and \(\mathrm{I^-}\) is a very weak base (stable anion), hence an excellent leaving group. R explains A: option (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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