Give one chemical test to distinguish between the following pairs of c – InterviewSolution

InterviewSolution

1.

Give one chemical test to distinguish between the following pairs of compounds:(i) Ethanol and 2 propanols.(ii) Aniline and ethylamine.

Answer»

Ethanol	2-Propanol
When treated with Lucas reagent (anhy. ZnCl₂ and cone. HCl), ethanol gives turbidity after heating	When treated with Lucas reagent, 2-propanol gives turbidity within five minutes without heating.

(ii) Aniline and ethylamine can be distinguished using the azo-dye test.

Aniline	Ethylamine
Aniline is treated with HNO₂ (NaNO₂ + dil. HCl) at 0- 5°C to give’ benzene diazonium chloride, which on further treatment with an alkaline solution of (3- naphthol gives red dye.	Ethylamine gives a brisk effervescence due to evolution of N₂ gas under similar conditions.

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