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Question

The foul smell produced during the carbylamine test and mustard oil test for primary amines are due to the formation of &
, respectively.

A
isocyanides
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B
isothiocyanates
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C
dithiocarbamic acid
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D
isocyanates
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Solution

The correct options are
A isocyanides
B isothiocyanates
Aliphatic and aromatic primary amines on heating with chloroform and ethanolic KOH form isocyanides or carbylamines which are foul smelling substances. This test is called carbylamine test. On treatment with carbon disulphide and mercuric chloride, primary amines produce isothiocyanates which have pungent smell, similar to that of mustard oil and this test is known as mustard oil test.

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