Choose the incorrect statement regarding chirality.

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Enantiomers are superimposable mirror images of each other.

A racemic mixture shows zero optical rotation .

The product obtained by ${SN}^{2}$ reaction of haloalkane having chirality at the reactive site shows inversion of configuration.

An alkyl halide containing one chiral carbon in ${SN}^{1}$ reaction gives racemic mixture

answer is C.

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Detailed Solution

• Enantiomers are non – superimposable mirror images.
• ${SN}^{1}$ reaction involves a flat carbocation intermediate that can be attacked from either face. Therefore, it usually gives a mixture of products with inversion and retention of configuration, If the starting compound is optically active.
• reactions takes place through a back side attack which inverts the stereochemistry of the C – atom .
• An equimolecular mixture of a pair of enantiomers is called racemic mixture. Hence, it is optically inactive.

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