How is thermal energy transferred during conduction? Check all that apply. 1.Thermal energy is transferred between particles that are not touching each other.
2.Thermal energy is transferred between particles that are in direct contact with each other.
3.Thermal energy is transferred between objects of different temperatures.
4.Thermal energy is transferred between objects of the same temperature.
5.Thermal energy is transferred from slow-moving particles to fast-moving particles.
6.Thermal energy is transferred from fast-moving particles to slow-moving particles.

that's what i got you can count the number of atoms

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.