Question

Which of the following has highest boiling point?
strongly
(1) 1-chloropentane
(2) 2-chloropentane
(3) 3-chloropentane
(4) All have equal boiling point​

Answer 1

2-chloropentane and 3-chloropentane are branched. So, its surface area is lower than that of 1−chloropentane. If surface area decreases the ability of molecules to interact through vanderwaal forcesdecrease, so the boiling point decreases.

So, 1−chloropentane has highest boiling point.