Haloalkanes and Haloarenes - Result Question 55
####55. Industrial preparation of chloroform employs acetone and
[1993]
(a) Phosgene
(b) Calcium hypochlorite
(c) Chlorine gas
(d) Sodium chloride.
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Solution:
- (b) By distilling ethanol or acetone with a paste of bleaching powder (laboratory and commercial method).
$CaOCl_2+H_2 O \longrightarrow Ca(OH)_2+Cl_2$
$Cl_2$, so obtained acts as a mild oxidising as well as chlorinating agent
(i) $CH_3 COCH_3+3 Cl_2$ $arrow CCl_3 \cdot CO \cdot CH_3+3 HCl$ (Chlorination) (ii) $2 CCl_3 \cdot CO \cdot CH_3+Ca(OH)_2 \longrightarrow$
$ 2 CHCl_3+(CH_3 COO)_2 Ca $ (Hydrolysis)
