An organic compound on reaction with 2,4-dinitrophenylhydrazine (2,4-DNP) gives a yellow precipitate. It also gives silver mirror on reaction with ammonical AgNO₃. It gives an alcohol and sodium salt of a carboxylic acid on reaction with concentrated NaOH. It yields benzene-1, 2-dicarboxylic acid on heating with alkaline KMnO₄. The structure of the compound among the following is

The compound gives positive (2,4-DNP) test indicating it contains either an aldehydic or ketonic functions group. But only aldehydes give silver mirror test with ammonical AgNO₃ Aldehyde without a-hydrogen atom reacts with  concentrated NaOH to give alcohol and sodium salt of carboxylic acid, according to Cannizaro reaction, and only O-substituted aldehyde undergoes oxidation to give disubstituted carboxylic acid. The sequence of reaction are as follows.