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Grignard Reagents

The blue colo...

Question

The blue colour developed during Lassaigne’s test for N is due to

A

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B

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C

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D

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Solution

The correct option is B
Lassaigne’s filtrate consist of NaCN and NaOH. When the filtrate is boiled with ferrous Sulphate solution, sodium ferrocyanide and ferric sulphate are obtained which further reacts to give $F e_{4} [F e (C N)_{6}]_{3}$ which gives blue colour.

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{N H}_{2} - {N H}_{2}

gives Prussian blue colour during Lassaigne test (element detection test). Reason: NaCN gives Prussian blue colour of

{F e}_{4} {[F e ({C N}_{6})]}_{3}

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