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Question

A 50/50 mixture of the d and l isomers of a given chiral compound has optical rotation zero. Such a mixture is said to be:

A
optically inactive and is called a racemic mixture
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B
optically inactive and is called a racemic modification
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C
optically active and is called a racemic mixture
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D
optically active and is called a racemic modification
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Solution

The correct option is C optically inactive and is called a racemic modification
A 50/50 mixture of the d and l isomers of a given chiral compound has optical rotation zero. Such a mixture is said to be optically inactive and is called a racemic modification. The optical inactivity is due to external compensation.

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