What is a Blanced chemicial reaction!

A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow. A chemical equation is a written symbolic representation of a chemical reaction.

Explanation:

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A balanced chemical is equation has equal numbers of atoms for each element involved in the reaction are represented on the reactant and product sides.

Explanation:

This is a requirement the equation must satisfy to be consistent with the law of conservation of matter.

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.