Question

distinguish test between acetophenone and benzaldehyde

Answer 1

Benzaldehyde and acetophenone can be distinguish by Iodoform test.

Methyl ketones are oxidized by sodium hypoiodite to give yellow ppt. of iodoform. Acetophenone being a methyl ketone responds to this test while  Benzaldehyde do not give iodoform test.

NaOI- Sodium hypoiodite

Answer 2

a) Tollen's Test
Aldehydes respond to Tollen's test. Benzaldehyde being an aldehyde reduces Tollen's reagent to give a red-brown precipitate of Cu2O,but acetophenone being a ketone doesn't.
b) Iodoform Test
Acetophenone being a methyl ketone undergoes oxidation by sodium hypoiodite to give a yellow precipitate of iodoform. But benzaldehyde doesn't respond to this test.