Arrange each set of compounds in order of increasing boiling points:
1-chloropropane, Isopropyl chloride, 1-chlorobutane.

Alkyl halides containing same alkyl group,the boiling point increases with an increase in the atomic mass of the halgoen. 1-chlorobutane is higher than that of isopropyl chloride and 1-chloropropane. Also, the boiling point decrease with an increase in branching in the chain. Thus, the boiling point of isopropyl alcohol is lower than chloropropane, i.e.

Isopropyl chloride < 1- chloropropane < 1- chlorobutane