1.

Give chemical tests to distinguish between the following pairs of compounds: (i)  Ethanal and Propanone.(ii)  Pentan-2-one and Pentan-3-one.

Answer»

(i)

Experiment EthanalPropanone
1.  Tollens Test: Warm the organic compound with freshly prepared ammonical silver nitrate solution(Tollen’s reagent).A bright silver mirror is produced.No silver mirror is formed.
2.  Fehlings Test: Heat the organic compound with Fehling’s reagent. A reddish bown precipitate is obtained. No precipitate is obtained

(ii)

Experiment Pentan-2-onePentan-3-one 
IodoformTest: The organic compound is heated with iodine in presence of sodium hydroxide solutionA yellow precipitate is obtained.No yellow precipitate is obtained.


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