Q.

Preparation of a compound X leads to a mixture with 20% racemization and 80% retention. What should be the observed rotation of the mixture, if [α]D=−12∘?

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a

+ 9.6°

b

- 9.6°

c

+2.4°

d

-2.4°

answer is B.

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Detailed Solution

αobs. =% retention × specific rotation αobs. =0.80−12∘=−9.6∘
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Preparation of a compound X leads to a mixture with 20% racemization and 80% retention. What should be the observed rotation of the mixture, if [α]D=−12∘?