Correct Answer - `c`
`CH -= CH + 2Cl_(2) + overset(C Cl_(4))(rarr) underset("Accetylene terrachloride")underset(1,1,2,2- "Tetrachloro ehtane or")underset("Westen or")(Cl_(2) CH - CHCl_(2)`
Westron is used an industrai solvent for rubber, fast and varnishes. It has some insecticidial action.