Which of the following statements is incorrect about amino acids?
Correct answer: C. If an amino acid has more than one asymmetric carbon atom, all the isomers shall be optically active
- A. All known α-amino acids possess an asymmetric carbon atom except glycine
- B. Certain antibiotics contain some amino acids in L-isomer form
- C. If an amino acid has more than one asymmetric carbon atom, all the isomers shall be optically active
- D. None of the above
Explanation
Statement C is incorrect.If an amino acid has multiple asymmetric carbon atoms , not all isomers will necessarily be optically active. For an isomer to be optically active, it must have a chiral carbon and lack a plane of symmetry. However, if an amino acid has multiple chiral carbons and possesses a plane of symmetry, some isomers may be meso compounds, which are optically inactive due to internal symmetry.
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