Which molecule has a structure that is most like aspirin?
propene
octyne
benzene
butane

Answer : The correct option is, Benzene.

Explanation :

Aspirin is also called as acetylsalicylic acid. It is used for medical purpose to treat pain, fever, or inflammation.

The formula of aspirin is,

The structure of aspirin contains structure of benzene, a carboxylic acid as a functional group and an ester functional group.

In the structure of propene , there are three carbon atoms and one double bond is present between the carbon-carbon atom.

In the structure of octyne , there are eight carbon atoms and one triple bond is present between the carbon-carbon atom.

In the structure of butane , there are four carbon atoms and all the carbon atoms are singly bonded to each other.

In the structure of benzene , there are six carbon atoms and the double bonds are present alternative carbon-carbon atom.

The structure of aspirin, propene, octyne, benzene, butane are shown below.

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.