3. When Sato rents a venue for prom, they usually get access to it the day of in order to decorate. This year, they get access around noon to start. The "balloon manager" knows
that as the day proceeds, the temperature will naturally drop and the balloons will
deflate because of this. To compensate for this, this kid plans to put extra air in the
balloons so that even when they deflate because of the falling temperature, they will still
look good. If the balloons need 1.5L of helium gas to stay looking good, and the
temperature that night is going to be 58°F, to what volume should the balloon manager
fill the balloons at midday when the temperature is 76°F?

answer; /// i do believe that the correct answer is (a) boiling

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.