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

(N H_{2})_{2} C O

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N H_{2} C_{6} H_{4} S O_{3} H

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H_{2} S O_{4}

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C H C l_{3}

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Solution

The correct option is B $N H_{2} C_{6} H_{4} S O_{3} H$
When both N and S are present in an organic compound, it gives a blood red colour in Lassaigne's test.

$C + N + S + N a \to N a^{+} C N S^{-}$

$F e^{3 +} + S C N^{-} ⟶ [F e (S C N)]^{2 +}$

The compound $[F e (S C N)]^{2 +}$ is responsible for the blood red colouration.

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