Question

What effect does branching of an alkane has on its boliling point?

Answer 1

As branching increases, the surface area of the molecule decreases which results in a small area of contact. As a result, the Van der Waals force also decreases which can be overcome at a relatively lower temperature. Hence, the boiling point of an alkane chain decreases with an increase in branching.

Answer 2

Explanation:

Vander Waals force of attraction is directly proportional to suface area. Surface area decreases with the increase in branching hence boiling point of an alkane decrease with increase in branching due to decrease in vander Waals force of attractions.

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