(a) Give ch

(a)

(i) Propanal and Propanone

Iodoform Test: Warm each compound with iodine and sodium hydroxide on a water bath.

Propanal: No yellow ppt is formed

Propanone: Yellow crystals of Iodoform are formed

(Fehling’s test can also be done)

(ii) Benzaldehyde and Acetophenone

Iodoform test: Warm each organic compound with iodine and sodium hydroxide solution.

Acetophenone: Yellow precipitates of iodoform are formedBenzaldehyde does not respond to this test

OR

(a)

(i) Cannizzaro reaction: Aldehydes which do not have an a-hydrogen atom, undergo self-oxidation and reduction reaction on treatment with concentrated alkali.

ii) Decarboxylation: Carboxylic acids lose carbon dioxide to form hydrocarbons when their sodium salts are heated with soda lime. The reaction is known as decarboxylation.

(b) The complete reactions are: