Match the catalyst with the process:
| Catalyst | Process | ||
| (i) | (p) | The oxidation of ethyne to ethanal | |
| (ii) | (q) | Polymerisation of alkynes | |
| (iii) | (r) | Oxidation of in the manufacture of | |
| (iv) | Nickel complexes | (s) | Polymerisation of ethylene |
Which of the following is the correct option [2019]