Aldehydes and ketones can be distinguished by:

Question

Aldehydes and ketones can be distinguished by: (A) Lucas test (B) Tollens reagent (C) Molishtest (D) none of these

Tardigrade Admin · Accepted Answer

The reagent used to distinguish aldehydes and ketones is one with which either aldehyde or ketone reacts.
[a] Lucas test: It is used to distinguish between

1^{\circ}, 2^{\circ}

and

3^{\circ}

alcohols.
The Lucas reagent is anhydrous

Z n C l_{2}

and cone.

H Cl

.
[b] Tollens reagent: It is ammoniacal silver nitrate solution. Aldehydes reduce it to silver mirror whereas ketones dont react with it.
So, Tollens reagent is used to distinguish between aldehydes and ketones.
[c] Molisch test: It is used to detect the presence of carbohydrate in solution. Formation of violet coloured ring at the junction of ale. a-naphthol solution and cone.

H_{2} S O_{4}

shows the presence of carbohydrate in the food.

Q. Aldehydes and ketones can be distinguished by:

Lucas test

Tollens reagent

Molishtest

none of these