A fire piston is a way to start fires without a match. If a fire piston compresses air from 1 atmosphere to 3 atmospheres of pressure and the air behaves ideally. How hot will the air get if it begins at 27 degrees Celsius? Answer in Celsius to the nearest degree. (Hint - Kelvin temperatures are 273.15 degrees more than the same temperature in Celsius)

law of conservation of matter

im pretty sure its b

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.