Check all statements below that ar true.
heating air under the balloon will cause the
air inside to expand.
the air inside will have the same mass but
more volume.
heating the air under the balloon will cause
the entire balloon to rise.
the outside temperature will have no affect
on the height of the balloon.
the only way to make the balloon sink is to
let out the air.

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.

it is reliable if two scientists recorded it