Water acts to dissolve molecules in the body. how does water dissolve the salt (nacl) in your mouth from a salty pretzel? view available hint(s) water acts to dissolve molecules in the body. how does water dissolve the salt (nacl) in your mouth from a salty pretzel? water acts as a cofactor for enzymes that dissolve the salt. when water is added to the nacl, nacl is broken down by adding oh- to one element and h+ to the other. this is known as hydrolysis. water acts as a solvent because the partial negative charge on the oxygen in water attracts sodium, while the partial positive charge on hydrogen attracts chloride. this results in the separation of sodium from chloride, thus breaking the ionic bond.

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.