Which of the following is not a member of the same homologous series?

Hydrocarbons used in our daily life are important; explain.

By which of the following processes are hydrocarbons obtained from petroleum?

$CH_3-CH(CH_3)-CH_3$ $\xrightarrow{KMnO_4} (A)$ $\xrightarrow[\Delta]{H^{+}} (B)$ $\xrightarrow[ROOR]{HBr} (C)$
Product $(C)$ in the above reactions is:

Which one of the following alkenes will react fastest with $H_2$ under catalytic hydrogenation condition?

Product $(C)$ is