Question

If A is the boiling point of propanamine and B is the boiling point of butanamine, what is the correct relation between the two?

(a) A > B

(b) B > A

(c) A = B

(d) A >> B

I have been asked this question during an online exam.

My question is based upon Amines Physical Properties topic in section Amines of Chemistry – Class 12

Answer 1

Correct choice is (b) B > A

Easy explanation: Butanamine is a larger molecule than ethanamine. As the carbon chain increase, the magnitude of van der Waals forces increases resulting in the increase in boiling point.