Identity the incorrect pair from the following:
(1) Photography - AgBr
(2) Polythene preparation - $\mathrm{TiCl}{4}, \mathrm{Al}\left(\mathrm{CH}{3}\right)_{3}$
(3) Haber process - Iron
(4) Wacker process $-\mathrm{PtCl} 2$
The catalyst used in Wacker’s process is $\mathrm{PdCl}_{2}$
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