Assertion (A): An optically active amino acid can exit in three forms depending on the $pH$ of the solution.
Reason (R): Amino acids contain both acidic and basic groups, they exist as zwetter ion in aq. medium, anionic form in acidic medium and cationic form in basic medium

Question

Assertion (A): An optically active amino acid can exit in three forms depending on the $pH$ of the solution.

Reason (R): Amino acids contain both acidic and basic groups, they exist as zwetter ion in aq. medium, anionic form in acidic medium and cationic form in basic medium

Aicharya · Accepted Answer

We know that amino acids can exist as a zwitter ion form which contains both positive and negative charge and in cationic form it exist in acidic medium because acid furnish $H^{+}$ which is abstracted by a base $(- {NH}_{2})$ , while in alkaline medium base is there which is capable of abstracting a proton from the carboxylic acid and so it also exists as anionic form.

Hence, we can conclude that depending on the $pH$ of the solution an optically active amino acid can exit in three forms.

Therefore, Assertion is correct but reason is wrong.

Assertion (A): An optically active amino acid can exit in three forms depending on the pH of the solution.…

Solution