Question

The correct order of boiling point of ethyl dimethyl amine , n-butyl amine and diethyl amineis

• A. $B>C>A$
• B. $B>A>C$
• C. $A>B>C$
• D. $C>B>A$

Answer 1

Answer: (A)

Among $1^{\circ },2^{\circ }$ and $3^{\circ }$ amines, the primary amine has the maximum strength to form the $H$ bond. The dipole-dipole attraction force also works between these molecules, hence the boiling point of primary amine is maximum. Between $2^{\circ }$ and $3^{\circ }$ amine, the tertiary amines does not from $H$-bond while secondary amine has some strength to form bond. $H$ - bond. Hence, the order of boiling point is as