1.

Give one good chemical test to distinguish between the following pairs of compounds:(i) Methanal and ethanal.(ii) Urea and benzoic acid.

Answer»

(i) Ethanal, on warming with iodine and NaOH solution gives a yellow crystalline precipitate of iodoform. Methanal does not give this test.

(ii) Urea when heated just above its melting point and treated with alkali and a drop of dilute copper sulphate solution, gives violet colour. While benzoic acid does not give this test.



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