Which of the following alkenes,on oxidation by $KMnO_4$ in dil. $H_2SO_4$,forms adipic acid?

When $2-$Methylbut$-2-$ene is treated with hydrogen chloride,the major product obtained is

An organic compound $X$ with molecular formula $C_{11}H_{14}$ gives an optically active compound on hydrogenation. Upon ozonolysis,$X$ produces a mixture of compounds $P$ and $Q$. Compound $P$ gives a yellow precipitate when treated with $I_{2}$ and $NaOH$ but does not reduce Tollen's reagent. Compound $Q$ does not give any yellow precipitate with $I_{2}$ and $NaOH$ but gives Fehling's test. The compound $X$ is:

What is the product of the reaction $CH_3CH_2CH=CH_2$ $\xrightarrow{1. Hg(OAc)_2, H_2O}$ $\xrightarrow{2. NaBD_4}$?

The major product formed when propene reacts with $HBr$ in the presence of peroxides is

What is $X$ in this reaction?