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  4. Lassaigne’s extract of thiourea, SC(NH2)2 is boiled with ferrous sulphate and then acidified with HCl, the colour of the resulting solution will be

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Q. Lassaigne’s extract of thiourea, $SC(NH_{2})_{2}$ is boiled with ferrous sulphate and then acidified with $HCl$, the colour of the resulting solution will be

Organic Chemistry – Some Basic Principles and Techniques

Solution:

Compounds having both N and S will form NaCNS leading to red coloured $Fe(CN)_{3}$ during Lassaigne’s test for nitrogen