MHTCET 15 May 2024 Shift 2 Paper

Concept: A zwitterion is a neutral molecule with both positive and negative charges on different atoms.Explanation:In glycine, the amino group ($-\mathrm{NH}_2$) accepts a proton to form $-\mathrm{NH}_3^+$.The carboxylic acid group ($-\mathrm{COOH}$) loses a proton to form $-\mathrm{COO}^-$.This internal salt has no net charge, so the correct structure is $\mathrm{H}_{3}\stackrel{+}{\mathrm{N}}-\mathrm{CH}_{2}-\mathrm{COO}^{-}$.This form exists at the isoelectric point where the molecule is electrically neutral.Answer: Option B: $\mathrm{H}_{3}\stackrel{+}{\mathrm{N}}-\mathrm{CH}_{2}-\mathrm{COO}^{-}$