Question Detail
Question
Which compound is not an isomer of the other three?
Correct Answer
Option D is the correct answer.
Detailed Explanation
n-Pentane, 2,2-dimethylpropane, and 2-methylbutane all have the molecular formula C5H12. 2,3-Dimethylbutane has the formula C6H14, so it is not an isomer of the other three.
Hint
Compare the molecular formulas of each compound.