Question

Cyclohexane, methylcyclopentane, 1, 3-dimethyl cyclobutane and 1, 2, 3-trimethyl cyclopropane are examples of which one of the following?

• A. Constitutional isomers
• B. Positional isomers
• C. Structural isomers
• D. Structural as well as positional isomers

Answer 1

The correct option is C Structural isomers

Structural isomerism (as per IUPAC) is the phenomenon in which two isomers have same molecular formula but differ in the arrangement of atoms. Nuclear (structural) isomers of $C_6{H}_{12}$ are as shown.