Question

(i) bromomethane, chloromethane, dichloromethane. Bromoform.(Increasing order of boiling points).

Answer 1

chloromethane
bromomethane
dichloromethane
bromoform...
as molecular mass increases boiling point increases

Answer 2

Boiling point directly depends on the molecular mass of a substance. That means "more the Molecular mass of a substance, more is the Boiling point"

(i) Bromomethane - CH₃Br - 95 amu

Chloromethane - CH₃Cl - 50.5 amu

Dichloromethane - CH₂Cl₂ - 85 amu

Bromoform - CHBr₃ - 253 amu

Hence the Boiling point order is:

Chloromethane < Dichloromethane < Bromomethane < Bromoform

Hope it helps!!