Concept:Both compounds are alkanes with the same molecular formula, so they belong to the same homologous series but are structural isomers.
Explanation:2-methylpropane and butane both have the molecular formula
C4H10.
They contain the same number of carbon atoms:
4 carbon atoms each.
Since they share the general formula
CnH2n+2, they are members of the same homologous series (alkanes).
However, their structures differ: butane has a straight chain, while 2-methylpropane has a branched chain.
This makes them structural isomers.
Their boiling points differ because branching affects intermolecular forces, so they do not have the same boiling points.
As alkanes, they have similar chemical properties, not different ones.
Therefore, the only correct statement is that they are members of the same homologous series.
Answer:B. They are members of same homologous series.