Two moles of an aldehyde react with concentrated solution of sodium hydroxide and produce one mole of acid and one mole of alcohol. The aldehyde is
(a) Acetaldehyde, CH3CHO
(b) Formaldehyde, HCHO
(c) Propionaldehyde, CH3CH2CHO
(d) Isobutyraldehyde, (CH3)2CHCHO