Ozonolysis of $2-$methyl$-2-$butene,in presence of $Zn,$ yields $--$

When $2-$butyne is treated with $H_2/$ Lindlar's catalyst,compound $X$ is produced as the major product and when treated with $Na/liq. NH_3$ it produces $Y$ as the major product. Which of the following statements is correct?

The reaction of a hydrocarbon with hypochlorous acid $(HOCl)$ gives $2-$chloroethanol. The hydrocarbon is .........

$A$ hydrocarbon containing $2$ carbon atoms gives Sabatier and Senderen's reaction but does not give a precipitate with ammoniacal silver nitrate solution. The hydrocarbon is:

Reaction of $Br_2$ on ethylene in the presence of $NaCl$ gives:

What are the steps involved in the synthesis of glycerol from propene?