How does acetylene react with
Hydrogen ? Write the balanced equations for the above reactions. Name the products.

Explanation

a) Addition of `Br (2):` Acetylene reacts with bromine to form finally `1,12,-2` tetra bromo ethane. `CH -= CH + Br _(2) to underset( Br ) underset(|) (CH) =underset(Br ) underset(|) (CH) - overset( Br _(2)) to underset( Br _(2)) underset(|) (CH) - underset(Br _(2)) underset(|) (CH)`
`1,1,2,2-` Tetra Bromo ethane
b) Addition of hydrogen : Accetylene undergoes addition reaction hydrogen in the presence of Ni catalyst and gives ethylene and ethane.
`H - C -= C -H + H _(2) overset( Ni ) underset( 14 0 ^(@) C ) tounderset( " Ethylene")(H _(2) C = CH _(2))`
`H _(2) C = CH _(2) + H _(2) overset(Ni) to underset( " Ethane ") (CH _(3) - CH _(3))`