First slide

Amino acids

Question

Statement 1: Alpha ( $α$ )-amino acids exist as internal salt in solution as they have amino and carboxylic acid groups in near vicinity.
Statement 2: H⁺ ion given by carboxylic group (–COOH) is captured by amino group (–NH₂) having lone pair of electrons.

Moderate

A

Both statements 1 and 2 are correct
B

Statement 1 is correct and statement 2 is incorrect
C

Statement 1 is incorrect and statement 2 is correct
D

Both statements 1 and 2 are incorrect

Solution

${NH}_{2} - {CH}_{2} - COOH$ is a typical $α$ -amino acid. In solution it exists as, internal salt or Zwitter ion,
$(^{+} {NH}_{3} - {CH}_{2} - {COO}^{-})$ because the proton (H⁺) of COOH group is captured by NH₂ group as NH₂ has a lone pair of electrons on N atom.

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