Choose the correct statements from the following related to glycine amino acid.

(A). Water soluble a-amino acid.
(B). It has both amino and carboxylic groups in its structure.
(C). It is optically inactive.
(D). It is a non-essential amino acid.

Choose the correct answer from the options given below:

(A), (B), (C) and (D)

The correct answer is Option (1) → (A), (B), (C) and (D)

Analysis of the Statements

• (A). Water soluble $\alpha$-amino acid: CORRECT. Glycine is highly soluble in water due to its ability to form a zwitterion (a molecule with both a positive and negative charge). As the simplest $\alpha$-amino acid, it is polar and hydrophilic.
• (B). It has both amino and carboxylic groups: CORRECT. Like all amino acids, glycine's structure includes a central carbon (the $\alpha$-carbon) bonded to an amino group ($-NH_2$) and a carboxylic acid group ($-COOH$).
• (C). It is optically inactive: CORRECT. Glycine is the only common amino acid that is achiral (optically inactive). For a molecule to be optically active, the $\alpha$-carbon must be bonded to four different groups. In glycine, the side chain is a single hydrogen atom, meaning the $\alpha$-carbon is bonded to two hydrogens, making it symmetrical.
• (D). It is a non-essential amino acid: CORRECT. A "non-essential" amino acid is one that the human body can synthesize on its own (primarily from serine) and does not strictly need to be obtained from the diet.