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  4. Which of the following amino acid is optically inactive?

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Q. Which of the following amino acid is optically inactive?

BHUBHU 2005

Solution:

Optical isomers have all 4 different groups attached to same carbon atom.
Phenylalanine, glutamic acid aspargine have 4 different groups attached to carbon atom. But glycine has two identical groups attached to it. Therefore, glycine does not show optical activity.

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