Name the reaction,heating of $1,2-$dibromoethane with zinc powder?

Acid-catalyzed hydration of alkenes,except ethene,leads to the formation of:

One mole of alkene $\underline{X}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The $IUPAC$ name of $\underline{X}$ is

The reaction of propene with $HOCl$ proceeds via the addition of

In the given reaction,$(x)$ will be:

The energy profile diagram for the dehydration of $2-$butanol using concentrated $H_2SO_4$ is given below. The product $(b)$ of the above reaction is: