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

The product $(P)$ in the reaction is:

The major product $[R]$ in the following sequence of reactions is :-

Relationship between products $(Q)$ and $(S)$ is
$CH_3-CH=CH_2$ $\xrightarrow[H_2O_2, OH^{-}]{BH_3, THF}$ $(P)$ $\xrightarrow[CH_2Cl_2]{PCC}$ $(Q)$
$CH_3-CH=CH_2$ $\xrightarrow[NaBH_4, HO^{-}]{Hg(OAc)_2, H_2O}$ $(R)$ $\xrightarrow[CH_2Cl_2]{PCC}$ $(S)$

The product$(s)$ from the above reaction will be

$Ph-C \equiv C-CH_3 \xrightarrow{Hg^{2+}/H^{+}} A$. $A$ is