AP EAMCET · Chemistry · Biomolecules

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

A $A$ and $R$ are correct and $R$ is the correct explanation for $A$
B $A$ and $R$ are correct but $R$ is not the correct explanation for $A$
C $A$ is correct, $R$ is wrong
D $A$ is wrong, $R$ is correct

Verified Solution

Answer & Solution

Correct Answer

(C) $A$ is correct, $R$ is wrong

Step-by-step Solution

Detailed explanation

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 (-NH2), while in alkaline medium base is there which is capable of…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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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

Step-by-step Solution

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