Which one of the following gives foul smell when heated with $CHC{l}_3$ and caustic potash and also forms a diazonium salt as final product with Nitrous acid at 278K

:   (1), (2) , (4) –   1°amines

They all give foul smell with $CHC{l}_3+KOH\left(alc\right)$ on heating

But only (4) which is a 1°  aryl amine gives diazonium salt with $\left(NaN{O}_2+HCl\right)$ at 278K 

( 3 )….is a sec. amine ,it does not give positive carbyl amine test