Read this scenario, and then answer the questions that follow. Human transportation enabled a species of beetle to move from Asia to North America. This beetle feeds on a particular species of flowering trees. In its native habitat, predators control its population. However, the beetle has fewer predators in North America.

A group of scientists studied the effect this beetle has on the tree population in the forest. After five years of research, they determined that the beetle population doubled each year. On the other hand, the number of healthy trees decreased by 40 percent from the previous year’s population. During the first year of their research, the scientists estimated that there were 250 beetles and 4,000 healthy trees in the forest area.

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