Specific test

Specific test: Formaldehyde Acetaldehyde Salicylic acid test Ald. + few salicylic acid + 4 drops Conc. H2SO4 (on the wall) Crimson red color Not done 2. Iodoform test Ald. + H2O + 10% NaOH + xss I2 No reaction 1. Yellow ppt 3. Na– nitroprusside test Ald. + Na– nitroprusside + xss 10% NaOH No reaction Red color 2.

Specific test: Benzaldehyde Acetophenone 1. Auto oxidation test White crystals of benzoic acid −− 2. Iodoform test 1. No reaction Yellow ppt 3. Na– nitroprusside test 2. No reaction Red color 4. Odour Bitter almond odor −− 3. Meta– dinitrobenzene test Acetophenone + Ethaol + few gm m-dinitrobenzene + xss 10% NaOH Violet color in the alcoholic layer −−

Specific test of Chlorahydrate: Specific test of acetone: 1. Iodoform test Yellow ppt 2. Na– nitroprusside test Red color 3. Meta– dinitrobenzene test Acetone + few gm m-dinitrobenzene + xss 10% NaOH shaking Deep violet color & slowly fade Specific test of Chlorahydrate: 1. Soda lime Sweety odor of chloroform odour 2. 30% NaOH Sweety odor of chloroform odour + droplets of oil 3. Conc H2SO4 Separation of an oily layer of Chloral

IR Location Comment 1725 cm -1 C=O streatching band of aldehyde C=O streatching band of ketone < 3000 cm -1 CH aliphatic streatching band > 3000 cm -1 CH aromatic streatching band

aldehyde keton