Which of the following statements is true? Select one:
The molecules of liquid water interact with one another, and those of water
vapor do not
The molecules of liquid water are bigger than the molecules of water vapor
The molecules of liquid water and water vapor have a different atomic
composition
The molecules of liquid water have less kinetic energy than those of water
vapor

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.