Assertion (A): In case of optically active alkyl halides, SN¹ reactions are accompanied by racemisation .
Reason (R): The attack of nucleophile is accomplished from either side of the plane of carbocation

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A and R are true ‘R’ does not explain A

A and R are true ‘R’ explains A

A is true R is false

Both A and R are false

answer is A.

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Detailed Solution

Carbocations are intermediate in SN¹ reactions. Carbocations being sp² hybridized are planar species, therefore, attack of nucleophile on it can occur from both front and rear with almost equal ease, giving a racemic mixture.

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