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Q.
Which of the following is not an amino acid?
Biomolecules
Solution:
Benzidine is not an amino acid but it is a aromatic amine. Its molecular formula is $C _{12} H _{12} N _{2}$.
Its IUPAC name is $4,4^{\prime}$-diaminobiphenyl, which is used as part of a test for cyanide and also in the synthesis of dyes.