a) Describe the structure of aldehyde and ketones.

b) Discuss preparation of aldehydes and ketones by oxidation of alcohols.

c) Discuss following reactions of aldehydes and ketones: i) Common to both;  2,4-DNPH to detect the presence of carbonyl group  HCN to show mechanism of nucleophilic addition reaction  Reduction with NaBH4 or LiAlH4 ii) Reactions in which Aldehydes differs from ketones i.e. Oxidation with Tollen’s reagent and Fehling’s solution. iii) Reaction which show presence of CH3CO– group in aldehydes and ketones Triiodomethane test (Iodo form test) using alkaline aqueous iodine.