Doubt from practical organic chemistry

Please give me detailed explaination for the below?


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It should be B.

Pls do give explanation

Look for providing Lassaigne's test carbon and nitrogen both must be required in compound as formation sodium cyanide happens. Dizonium salts are stable only at low temperature and decomposes at high temperature to provide nitrogen so there is no chance to give Lassaigne's test. Hydrazine is not possible as there is no carbon there. Urea is a famous compound to give Lassaigne's test.

Ok what about the fourth option(both nitrogen and carbon is present in the compound)

It will not give blue colour but blood red colour due to presence of sulphur.

Thanks everyone .

Yes .thanks