Identity the incorrect pair from the following:

Checking each pair:

- Photography - AgBr: Correct. Silver bromide is used in photographic films.

- Polythene preparation - $$TiCl_4$$, $$Al(CH_3)_3$$: Correct. These are Ziegler-Natta catalysts.

- Haber process - Iron: Correct. Iron is the catalyst in the Haber process.

- Wacker process - $$PtCl_2$$: Incorrect. The Wacker process uses $$PdCl_2$$ (palladium chloride), not $$PtCl_2$$.

The incorrect pair corresponds to Option (4).