During the ozonolysis of $CH_2 = CH_2$,if hydrolysis is performed in the absence of $Zn$ dust,the product obtained will be ...............

Final product formed on reduction of glycerol by hydroiodic acid is

What is $X$ in the following reaction?

The major product formed when $but-2-ene$ is reacted with $O_3$ followed by treatment with $Zn / H_2O$ 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:

$A$ gas that decolourises $KMnO_4$ solution but gives no precipitate with ammoniacal cuprous chloride is