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Question

Which of the following compound will give a blood red colour while doing Lassaigne's test?

A
(NH2)2CO
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B
NH2C6H4SO3H
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C
H2SO4
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D
CHCl3
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Solution

The correct option is B NH2C6H4SO3H
When both N and S are present in an organic compound, it gives a blood red colour in Lassaigne's test.

C+N+S+NaNa+CNS

Fe3++SCN[Fe(SCN)]2+

The compound [Fe(SCN)]2+ is responsible for the blood red colouration.

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