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

The reaction,$H_2C=CH_2$ (Ethylene) $+ H_2O$ (water) $\xrightarrow{H_3PO_4, 300 \ ^\circ C/60 \ atm}$ $C_2H_5OH$ (Ethyl alcohol) is called:

Number of shared electrons between carbon-carbon atoms in an ethylene molecule is

The product of the reaction shown below is:

What is the product obtained from the reaction of $HCl$,$HBr$,and $HI$ with alkenes in the presence of peroxide?

In which of the following,addition of $HBr$ does not take place against Markownikoff's rule,or for which is the Anti-Markownikoff addition of $HBr$ not observed?