Which type of reactions are easily performed by alkane and alkene?

Which one of the following has the minimum boiling point?

The dibromo compound $[P]$ (molecular formula : $C_{9}H_{10}Br_{2}$) when heated with excess sodamide followed by treatment with dilute $HCl$ gives $[Q]$. On warming $[Q]$ with mercuric sulphate and dilute sulphuric acid yields $[R]$ which gives positive Iodoform test but negative Tollen's test. The compound $[P]$ is:

The major product $[C]$ of the following reaction sequence will be

Which of the following most accurately describes the first step in the reaction of hydrogen chloride with $1$-butene?

If the mixture of the following four aromatic compounds is oxidized by a strong oxidizing agent,what is the product?