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Question

Which of the following compounds gives blood red colouration when its Lassaignes extract is treated with ferric chloride?

A
Thiourea (CH4N2S)
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B
Diphenyl sulphide (C12H10S)
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C
Phenyl hydrazine (C6H8N2)
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D
Benzamide (C7H7NO)
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Solution

The correct option is A Thiourea (CH4N2S)
Thiourea is a compound which has got sulphur, carbon, and nitrogen.
The sodium fusion extract of the compound will have thiocyanate ions resulting red colour of ferric ions.
NaCNS+FeCl3[Fe(SCN)]2+Blood Red
Hence answer is option A.

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