This reaction is not balanced. Let's balance it.

The unbalanced equation is: CH4 + C2H2 + C2H4 + C2H5OH = C2H4 + C2H4Br2

Balanced equation: 3CH4 + 2C2H2 + 2C2H4 + C2H5OH = 2C2H4 + C2H4Br2