Carboxylic Acids And Its Derivatives

\(P \xrightarrow{\mathrm{H}_2 / \text { Pd- } \mathrm{BaSO}_4} Q \xrightarrow[\text { (ii)Dil. } \mathrm{HCl}]{\text { (i) Con. } \mathrm{NaOH}}\)

\(R\) and \(S\) form benzyl benzoate when treated with each other. Hence \(P\) is