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

Which of the following compounds gives blood red colouration when its

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 phenylhydrazine benzamide Solution :Thiourea `(NH_(2)CSNH_(2))` contains both N and S and hence GIVES blood red colouration in Lassaigne's test.