Which of the following is incorrect?

Options

A. The naturally occuring amino acids, the building blocks of protins, are all `D`-amino acids
B. The `D,L` method for assiging relative configurations (used mainly for sugas) uses glyceraldehyde as the reference molecule.
C. Esterification of `(-)-`Lactic acid with methanol gives `(+)-` methy`1` lacate.
D. sign of rotation is a molecular property unrelated to configuration

Answer

A

Explanation

The naturally occuring amino acids, the building blocks of proteins, are all `L-`amino acids.

For `L-`amino acids, `COOH` is always placed at the top in the Fischer projection, the carbon chain runs vertically and `NH_(2)` is on the left. Amino acids differ form one anothe by the nature of the alky`1` group.