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  4. Aniline on heating with X in the presence of KOH gives a product with very bad smell. Which of the following is X?

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Q. Aniline on heating with X in the presence of KOH gives a product with very bad smell. Which of the following is X?

EAMCETEAMCET 2000

Solution:

Carbyl amine test: This reaction is given by primary amines only. In this reaction $ {{\text{1}}^{\text{o}}}- $ amine reacts with chloroform and KOH to form isocyanides. which is a bad smelling compound. $ \text{78}\,\text{g}\,{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}} $ contains $ C=72 $ $ \text{100}\,\text{g}\,{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}} $ contains $ \text{C =}\frac{72}{78}\times 100=\frac{7200}{78} $ $ =92.3% $ $ 78\,g\,{{C}_{6}}{{H}_{6}} $ contains $ H=6 $ $ \text{100}\,\text{g}\,{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}} $ contains $ \text{C =}\frac{6}{78}\times 100=\frac{600}{78} $ $ =7.69% $ The answer is $ {{\text{C}}_{\text{2}}}{{\text{H}}_{\text{6}}} $ containing 80% carbon and 20% hydrogen.