Question

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

• A. $C{H}_{3}Cl$
• B. $CC{l}_4$
• C. $CHC{l}_3$
• D. $C_2{H}_{5}Cl$

Answer 1

Answer: (C)

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 $\text{C =}\frac{72}{78}\times 100=\frac{7200}{78}$ $=92.3$ $78g{C}_6{H}_6$ 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.