When someone tries to sell gold to a jeweler, the jeweler must be certain that the object is pure gold. To determine this, they calculate the density
of the object given to them. Gold has a density of 19.3 g/mL. If someone
brings in 13 mL of "gold", what would the mass of real gold be?

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.

i think it's letter a.

here are some of the ways in which chemical and nuclear reactions differ.

explanation: