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Introduction to Inorganic Chemistry

Which of the ...

Question

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

A

Thiourea

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B

Diphenyl sulphide

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C

Phenyl hydrazine

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D

Benzamide

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Solution

The correct option is D Thiourea
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.
Hence answer is option A

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