Assertion : Alpha $(\alpha)$-amino acids exist as internal salt in solution as they have amino and carboxylic acid groups in near vicinity. Reason: $\mathrm{H}^{+}$ion given by carboxylic group $(-\mathrm{COOH})$ is captured by amino group $\left(-\mathrm{NH}_2\right)$ having lone pair of electrons.

Question

Assertion : Alpha $(\alpha)$-amino acids exist as internal salt in solution as they have amino and carboxylic acid groups in near vicinity. Reason: $\mathrm{H}^{+}$ion given by carboxylic group $(-\mathrm{COOH})$ is captured by amino group $\left(-\mathrm{NH}_2\right)$ having lone pair of electrons., If both assertion and reason are true and reason is the correct explanation of assertion., If both assertion and reason are true but reason is not the correct explanation of assertion., If assertion is true but reason is false., If both assertion and reason are false.

MARKS App · Accepted Answer

$\mathrm{NH}_2-\mathrm{CH}_2-\mathrm{COOH}$ is a typical $\alpha$-amino acid. In solution it exists as, internal salt or Zwitter ion, $\left({ }^{+} \mathrm{NH}_3-\mathrm{CH}_2-\mathrm{COO}^{-}\right)$ because the proton $\left(\mathrm{H}^{+}\right)$of $\mathrm{COOH}$ group is captured by $-\mathrm{NH}_2$ group as $\mathrm{NH}_2$ has a lone pair of electrons on $\mathrm{N}$ atom.

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