Answer b-e

b) electricity currently costs about $0.12 per kilowatt hour. in the form of electricity, how many joules can you get for a dollar?

c) a standard cubic foot of natural gas carries with it about 1.1 x 106 j of energy. natural gas currently costs about $16.25 per thousand cubic feet. how many joules of energy in the form of natural gas can you get for a dollar?

d) a short ton of coal holds about 2.24 x 107 j of energy and costs about $56.45 per short ton. how many joules of energy in the form of coal can you get for a dollar?

e)corn oil costs about $0.24 per fluid ounce wholesale. a fluid ounce carries 240 dietary calories. how many joules of energy in the form of corn oil can you get for a dollar?

its going to be mutualism cuz they both benefit from the relationship.

~batmans wife dun dun

i believe the answer is true.

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.