The catalyst used for the polymerisation of olefins is:
Correct option is A. Ziegler Natta catalyst
Combination of $$TiCl_4$$ and $$Al(C _2H _5 )_3$$ called as Ziegler Natta catalyst, used in the synthesis of polymers of 1-alkenes (alpha-olefins) i.e. polymerization of olefins.
Wilkinson's catalyst is best known for catalyzing the hydrogenation of olefins with molecular hydrogen.
Palladium is widely used in catalytic reactions, such as in hydrogenation of unsaturated hydrocarbons.
Zeise's salt that is used for the optical resolution of alkenes.
Hence, option $$A$$ is the correct answer.