Question

Which of the following statement(s) is/are correct about amino acids?

• A. Amino acids are colourless, crystalline solids.
• B. They are soluble in water and solubility varies with $R$-group of amino acid.
• C. They have sharp and low melting points.
• D. All amino acids (except glycine) are optically active

Answer 1

Answer: (A), (B), (D)

All amino acids (except glycine) are optically active

Amino acids are colourless, crystalline solids.
All amino acids have a high melting point greater than ${200}^{\circ }C$
Solubility: They are soluble in water. Solubility depends on R-group of amino acids and $pH$ of the solvent.
All amino acids (except glycine) are optically active.
Hence, (a), (b), (d) are correct options.