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Assertion(A):For a single chiral carbon containing alkyl halide, substitution takes place at chiral centre, ${'S}_{N} 1'$ reaction leads to racemisation.
Reason( R): The attack of the nucleophile may be accomplished from either side of the plane of the intermediate carbocation formed in the reaction .

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Both A and R are correct; R is the correct explanation of A

Both A and R are correct; R is not the correct explanation of A

A is correct; R is incorrect

R is correct; A is incorrect

answer is A.

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Detailed Solution

In case of optically active alkyl halides SN¹ reactions are accompanied by racemization. The carbocation formed in the slow step being sp² hybridized is planar. The attack of the nucleophile may be from either side resulting mixture of products.

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