When ethylene bromide is treated with $Zn$,we get

What is $X$ in this reaction?

The intermediate during the addition of $HCl$ to propene in the presence of peroxide is

The major products obtained during ozonolysis of $2,3-$dimethyl$-1-$butene and subsequent reduction with $Zn$ and $H_2O$ are

Cyclohexene is reacted with bromine in $CCl_4$ in the dark. The product of the reaction is,

Ozonolysis of which compound gives $OHC-CH_2-CH(CH_3)-CH_2-CHO$?