1. Specific test

2. 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.

3. 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 −−

4. 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

5. 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

6. aldehyde
keton