Which of the following is a characteristic of a catalyst?

Which catalyst is used in the Wacker process?

Match the catalysts to the correct processes:

Catalyst	Process
$A. TiCl_4$	$i. \text{Wacker process}$
$B. PdCl_2$	$ii. \text{Ziegler-Natta polymerization}$
$C. CuCl_2$	$iii. \text{Contact process}$
$D. V_2O_5$	$iv. \text{Deacon's process}$

In the case of auto catalysis:

Catalysts in the following reactions are:
$(I) CH_3COOCH_{3(l)} + H_2O_{(l)} \rightarrow CH_3COOH_{(aq)} + CH_3OH_{(l)}$
$(II) 2SO_{2(g)} + O_{2(g)} \rightarrow 2SO_{3(g)}$ (Contact Process)
$(III) 2SO_{2(g)} + O_{2(g)} \rightarrow 2SO_{3(g)}$ (Lead Chamber Process)
$(IV) N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}$ (Haber Process)

Which of the following represents homogeneous catalysis?