Match List I with List II
A. Cobalt catalyst        I. (H$$_2$$ + Cl$$_2$$) production
B. Syngas                     II. Water gas production
C. Nickel catalyst        III. Coal gasification
D. Brine solution         IV. Methanol production
Choose the correct answer from the options given below:-

Cobalt catalysts are used in the hydrogenation of carbon monoxide to produce methanol from synthesis gas. Therefore, cobalt catalyst is associated with methanol production.

Hence,

$$A \rightarrow IV.$$

Syngas is a mixture of carbon monoxide and hydrogen that is obtained during the gasification of coal with steam. Therefore, syngas is associated with coal gasification.

Hence,

$$B \rightarrow III.$$

Nickel is widely used as a catalyst in reactions involving hydrogen and is employed in the production and utilization of water gas. Therefore, nickel catalyst is matched with water gas production.

Hence,

$$C \rightarrow II.$$

Brine solution undergoes electrolysis to produce hydrogen gas at the cathode and chlorine gas at the anode. Therefore, brine solution is associated with the production of (H_2) and (Cl_2).

Hence,

$$D \rightarrow I.$$

Therefore, the correct matching is

$$A \rightarrow IV,\qquad B \rightarrow III,\qquad C \rightarrow II,\qquad D \rightarrow I.$$