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1.

Explain the laboratory preparation of chloroform.

Answer»

Haloform reaction:

Chloroform is prepared in the laboratory by the reaction between ethyl alcohol with bleaching powder followed by the distillation of the final product chloroform. Bleaching powder acts as a source of chlorine and calcium hydroxide.

The reaction take place in 3 steps.

Step 1:

Oxidation-

Step 2:

Chlorination-

Step 3:

Hydrolysis

2.

Mention the uses of chloroform.

Answer»
  • Chloroform is used as a solvent in pharmaceutical industry.
  • It is used for producing pesticides and drugs.
  • It is used as an anaesthetic.
3.

When chloroform is treated with primary amine and KOH, we get ……

Answer»

When chloroform is treated with primary amine and KOH, we getOffensive odours.

4.

Consider the reaction, CH3CH2CH2 Br + NaCN → CH3CH2CH2CN + NaBr This reaction will be the fastest in ……(a) ethanol(b) methanol(c) DMF (N, N’ – dimethyl forrnamide)(d) water

Answer»

(c) DMF (N, N’ – dimethyl fonuarnide)

5.

Reaction of ethyl chloride with sodium metal leads to the formation of

Answer»

Reaction of ethyl chloride with sodium metal leads to the formation ofn-Butane.

6.

In Wurtz fittig reaction, chiorohenzene is converted to by reacting it with ethyl chloride.

Answer»

Ethylbenzene