Answer
The structural formula given in this question is different from the structural formula given in the sample problem.
Work Step by Step
Structural formula of the compound given in this question is 5 carbon chain and methyl group is attached at Number 3 position and the compounds given in the sample problem have different structural formula first one compound have 5 carbon Chain and methyl group is attached at number 2 position, the second one compound has four carbon chain and are methyl groups are attached at second and third position