Which of the following would not rearrange to a more stable form?

Cyclohexane,a hydrocarbon,floats on water because:

Product $(A)$ of the reaction is

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

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

What are $B$ and $C$ respectively in the following set of reactions?
$C \xleftarrow[\Delta]{Zn} 1,2-\text{dibromopropane}$ $\xrightarrow[\text {(ii) } NaNH_2]{\text {(i) alc. } KOH} A$ $\xrightarrow[\text { Catalyst }]{\text { Lindlar }} B$