Arrange each set of compounds in order of increasing boiling points.
Bromomethane, Bromoform, Chloromethane, Dibromomcthane.

Explanation

`underset("Brommethane ")(CH_3 -Br) underset("Bromoform")(CHBr_3) . underset("chloromethane")(CH_3 -Cl) underset("Dibramomethane")(CH_2 Br_2)`
More the molecular mass, more the boiling point. Therefore, increasing order of b.p. is Chloromethane < Bromomethane < Dibromomethane < Bromoform