Which one of the following contain isopropyl group

Options

A. 2,2,3,3-tetramethylpentane
B. 2-methylpentane
C. 2,2,3-trimethylpentane
D. 3,3-dimethylpentane

Answer

B

Explanation

`underset("2,2,3,3-tetramethylpentane")(H_(3)C - H_(2)C - overset(CH_(3))overset(|)underset(CH_(3))underset(|)C - overset(CH_(3))overset(|)underset(CH_(3))underset(|)C -CH_(3))`
`underset("2-methylpentane")(H_(3)C H_(2)C - H_(2)C - overset(CH_(3))overset(|)HC - CH_(3))`