Consider a system consisting of a cylinder with a movable piston containing 106 gas molecules at 298 k at a volume of 1 l. consider the following descriptions of this system:
initial system, as stated in the problem statement.
starting from the initial system, the volume of the container is changed to 2 l and the temperature to 395 k.
starting from the initial system, a combination reaction occurs at constant volume and temperature.
starting from the initial system, the gas reacts completely to produce 107 gas molecules at 395 k in a volume of 2 l.
starting from the initial system, the temperature is changed to 395 k at constant volume.
arrange the descriptions in order of increasing number of microstates in the resulting system.

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.

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