Question

Pure chloroform is prepared by
(a) distilling chloral hydrate with aqueous sodium
hydroxide
(b) heating ethanol with bleaching powder
(c) heating acetone with bleaching powder
(d) reducing carbon tetrachloride

Answer 1

Pure chloroform is prepared by

(a) distilling chloral hydrate with aqueous sodium

hydroxide

(b) heating ethanol with bleaching powder

(c) heating acetone with bleaching powder

(d) reducing carbon tetrachloride

Answer 2

Distilling chloral hydrate with aqueous sodium gives pure chloroform.

Explanation:

• Chloral hydrate is one of the pure forms of chloral from which chloral can be easily obtained.

• Its molecular formula is C2HCl3(OH)2.

• Its a bi carbon compound.

• The reaction of chloral hydrate with aqueous sodium or sodium hydroxide gives

• C2HCl3(OH)2 +NaOH - > CHCl3 + HCOONa + H2O.

• The sodium formate is produced in solution.

• Chloroform being non soluble in water, forms a separate layer at the top of the solution which is collected and purified.

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