Catalysis Questions

Match List - I with List - II:List-IA. Haber processB. Wacker oxidationC. Wilkinson catalystD. Ziegler catalystList-III. $\text{Fe}$ catalystII. ${\text{PdCl}}_2$ III. $[({\text{PPh}}_3{)}_3\text{RhCl}]$ IV. ${\text{TiCl}}_4$ with ${\text{Al(CH}}_3{)}_3$ Choose the correct answer from the options given below:

Assertion : Reaction of ${\text{SO}}_2$ and ${\text{H}}_2\text{S}$ in the presence of ${\text{Fe}}_2{\text{O}}_3$ catalyst gives elemental sulphur.Reason : ${\text{SO}}_2$ is a reducing agent.

The catalytic activity of transition metals and their compounds is ascribed mainly to: