Question

In order to distinguish between $C_2{H}_{5}N{H}_2$ and $C_6{H}_{5}N{H}_2$, which of the following reagents is useful?

• A. Hinsberg reagent
• B. $\beta$-Naphthol
• C. Benzene diazonium chloride
• D. None of the above

Answer 1

The correct option is B $\beta$-Naphthol

The reaction of Aniline ($C_6{H}_{5}N{H}_2$ )with $NaN{O}_2$ in presence of concentrated $HCl$ give diazonium salt. This reaction is known as diazotisation while ethylamine($C_2{H}_{5}N{H}_2$) does not give diazonium salt with $NaN{O}_2$ in presence of concentrated $HCl$

when diazonium salt of aniline $C_6{H}_{5}N{H}_2$ reacts with alkaline solution of $\beta$β- naphthol to form azo dye which show colour.