Having difficulty with this equilibrium question for chemistry class: At 2000°C, the equilibrium constant for the reaction given below is 6.4 x 10-7. If
a sample of CO2 initially at a concentration of 0.500 mol/L, is allowed to come to
equilibrium at this temperature, what will be the equilibrium concentration of
CO?

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.