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Sulphur

On adding FeC...

Question

On adding $F e C l_{3}$ to the acidic Lassaignes solution a blood red colour is obtained. It indicates the presence of

A

S

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B

C

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C

N

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D

Both S and N

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Solution

The correct option is D Both S and N
If organic compound contains both N and S then sodium fusion extract contains sodium Isocyanate which gives blood red colour with neutral ferric chloride
$N a + C + N + S - - \to N a S C N$
$3 N a S C N + F e C l_{3} - \to F e (S C N)_{3} + 3 N a C l$
Blood red colour

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