Think about how the scale of cells compares to the scale of other objects. Launch the Scale Tool and complete the table below by finding examples of objects at each scale that is listed. Some parts of
the table have been completed for you.
Scale
Objects at this scale
Size of object
thousands of kilometers
thousands of meters
depth of the Grand Canyon
8 meters
meters
orca
centimeters
red blood cell
8 micrometers
micrometers
nanometers

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.