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Q.

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

A is true but R is false

b

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

c

A is false but R is true.

d

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 −NH2​ group on the left-hand side.
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