Atoms, Elements, Compounds & Mixtures Task 1: Rewrite the sentences if you think they are wrong
All matter is made of tiny particles called elements
All matter is made of tiny particles called atoms.…………………
An element is a substance made of one atom
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Air, sea water and oxygen are mixtures
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Compounds are easily separated as their atoms are not chemically joined together
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by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /

the awnser is group 12

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.