Which answer choices are true statements about the properties of an enclosed gas?
select all that apply.
if the temperature of a gas remains constant, then increasing its volume will decrease its pressure.
if the volume of a gas remains constant, then increasing its temperature will increase its pressure.
if the pressure of a gas remains constant, then increasing its temperature will increase its volume.
if the temperature of a gas remains constant, then increasing its volume will increase its pressure

the answer to this question is 3.

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.