The acid showing salt like a character in an aqueous solution is

\(\alpha\)-aminoacetic acid

The correct answer is option 4. α-aminoacetic acid.

α-aminoacetic acid, also known as glycine, is an amino acid that has both a carboxyl group and an amino group. These two groups can form a salt-like bond, which gives glycine a zwitterionic character.

A zwitterion is a molecule that has both a positive and a negative charge. This is because the carboxyl group donates a proton to the amino group, which results in the formation of a negatively charged carboxylate ion and a positively charged ammonium ion.

The other three acids, acetic acid, benzoic acid, and formic acid, do not have both a carboxyl group and an amino group. Therefore, they do not have a zwitterionic character and do not show a salt-like character in an aqueous solution.

Here is a table that summarizes the acids that show salt-like character in aqueous solution: