Question

Assertion
$\alpha$-amino acids exist as dipolar ions or zwitter ions.

Reason
$\alpha$-amino acids are the building blocks of proteins.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

A zwitter ion is a molecule that has both positive and negative regions of charge. It is amphoteric in nature. $\alpha$-Amino acid contain both basic and acidic group. In them amine is basic while carboxylic group is an acid group. Amine being basic accept the $H^{+}$ from $-COOH$ and leaves the $-COOH$ as $-CO{O}^{-}$. Thus form zwitter ion.
Proteins on partial hydrolysis give peptides of varying molecular masses which upon complete hydrolysis give 𝛼-amino acids.​
$\text{Natural protein}\stackrel{\text{Hydrolysis}}{\to }\text{Peptides}\stackrel{\text{Hydrolysis}}{\to }\alpha -\text{amino acids}$
Thus Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion