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Question

In the preparation of chloroform from ethyl alcohol and bleaching powder, the compound that is not formed is :

A
acetaldehyde.
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B
chloral.
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C
phosgene.
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D
trichloro acetaldehyde.
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Solution

The correct option is C phosgene.
Following reactions are involved in the preparation of chloroform:
CaOCl2+H2OCa(OH)2+Cl2
Then from alcohol,
CH3CH2OH+Cl22HCl−−−CH3CHOacetaldehyde+2HCl

CH3CHO+3Cl2CCl3CHOChlorol or Trichloro acetaldehyde+3HCl (chlorination)

2CCl3CHO+Ca(OH)22CHCl3Chloroform (hydrolysis)
Phosgene (COCl2) doesn't form in the whole process.

Hence, the correct option is C.

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