Question

Identify the isomer of pentane among the following options.

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Compounds having same molecular formula, but different arrangement of atoms are known as isomers.

The word root ‘pent’ in pentane indicates that the hydrocarbon chain is made up of five carbon atoms. The primary suffix ‘ane’ indicates that the hydrocarbon is of alkane family. The structure of pentane is:
The molecular formula of pentane is $C_5{H}_{12}$. Among the given options, hydrocarbon given in option (C) has the molecular formula $C_5{H}_{12}$. Therefore, it is an isomer of pentane.