Question

Arrange the given set of compounds in order of increasing boiling points. I. $1$-chloropropane II. Iso-propyl chloride III. $1$-chlorobutane

• A. II < III < I
• B. I < II < III
• C. II < I < III
• D. III < I < II

Answer 1

Answer: (C)

II < I < III

Answer 2

As the size of alkyl group or halogen atom increases, boiling point increase, because now more surface area is available. Hence the magnitude of van der Waals' forces of attraction increases. Boiling point decreases with branching due to decrease in surface area and hence, van der Waals' forces decreases. Thus, the correct order of boiling point is