Which statement best explains why newton's first law is correct even though real-world objects tend to eventually stop moving instead of remaining in motion?
a.) newtons first law does not apply in the real world.
b.) newtons first law does not take inertia into account.
c.) most objects are affected by unbalanced forces such as friction.
d.) newtons first law only applies to objects that are not already in motion.

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.