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Carboxylic acids are weak acids that reduce basic by releasing hydrogen ion salts. To generate a methyl group having carbonyl group, either carboxyl group of both a carboxyl group is linked to both an aromatic rings. An methyl or benzyl component may engage to the carboxyl member.

When strong acids combine with strong acids including $NaOH$and $KOH$to create carboxy compounds, these become entirely negated. By exchanging the ic acid (at the end) and ended up eating, the acetate cation is termed.

Potassium ethanoate is just the carboxylate salt constituted even before acid needs to react to $KOH.$

Potassium $2-$methylbutanoate is really the carboxylate salt founded when $2$-methylbutanoic acid needs to react to $KOH$.

Potassium $4-$chlorobenzoate is just the carboxylate compound obtained when $4-$chlorobenzoic acid burns to $KOH$.