The combination that correctly matches the process in Group-$1$ with the entries in Group-$2$ is

$\begin{array}{cc}\ &\text{Group-1} & \text{Group-2} \\ &\text{P. Wulff process} & \text{ I. Sulfur mining} \\ &\text{ Q. Sulfite process} & \text{II. Soda ash production} \\ &\text{R. Solvay process} & \text{III. Acetylene production } \\ &\text{S. Frasch process} & \text{IV. Pulp production} \\ \\ \end{array}$

1. $P-II$, $Q-IV$, $R-III$, $S-I$
2. $P-III$, $Q-IV$, $R-II$, $S-I$
3. $P-IV$, $Q-I$, $R-II$, $S-III$
4. $P-II$, $Q-I$, $R-IV$, $S-III$