1.

Which of the following compounds gives blood red colouration when its Lassaigne's extract is treated with alkali and ferric chloride .

Answer»

Thiourea
Diphenyl sulphide
Phenyl hydrazine
Benzamide

Solution :Thiourea CONTAINS both S and N and HENCE gives blood redcolouration when its LASSAIGNE's extract with alkali and `FeCl_(3)`.
`3NaCNS +FeCl_(3)rarrunderset(("Blood red"))underset("Ferric sulphocyanide")(FE(CNS)_(3)+3NaCl)`.


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