Assertion (A): All naturally occurring alpha-amino acids except glycine are optically active.
Reason (R): Most naturally occurring amino acids have L-configuration.
Select the most appropriate answer from the options given below:

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A is true but R is false

Both A and R are true but R is not the correct explanation of A.

A is false but R is true.

Both A and R are true and R is the correct explanation of A.

answer is A.

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Detailed Solution

Except for glycine, all other naturally occurring α− amino acids are optically active since the α− carbon atom is asymmetric.
These exist both in ′D′ and ′L′ forms. Most naturally occurring amino acids have a L− configuration.
L− amino acids are represented by writing the −NH₂group on the left-hand side.