Statement I: Amino acids exist as internal salt in solution as they have amino and carboxylic acid groups in near vicinity

Statement II: H⁺ ion given by carboxylic (–COOH) group is captured by amino (–NH₂) group having lone pair of electrons.

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

The correct answer is option (1) Both Statement I and Statement II are correct, and Statement II is the correct explanation of Statement I.

Statement I: Amino acids exist as internal salt in solution as they have amino and carboxylic acid groups in near vicinity.
This statement is correct. Amino acids contain both an amino group (-NH₂) and a carboxylic acid group (-COOH) in their molecular structure. In an aqueous solution, these functional groups can ionize, resulting in the formation of an internal salt. The amino group can donate a proton (H⁺) to the carboxyl group, leading to the formation of a zwitterion, which is a molecule with both a positive and negative charge on different atoms within the same molecule.

Statement II: H⁺ ion given by carboxylic (-COOH) group is captured by amino (-NH²) group having a lone pair of electrons.
This statement is also correct. In an aqueous solution, the carboxylic acid group of an amino acid can donate a hydrogen ion (H⁺) due to the presence of an acidic hydrogen attached to the oxygen atom. The amino group, which contains a lone pair of electrons, can accept this hydrogen ion, resulting in the formation of an internal salt or zwitterion.

Furthermore, Statement II is the correct explanation of Statement I. The capture of the H+ ion by the amino group helps neutralize the positive charge on the amino group and the negative charge on the carboxylate group, leading to the formation of the internal salt or zwitterion structure in solution.