Identify the reactions in List I

The actual reactants/products in List I are not rendered clearly in the prompt, but the four named reactions in List II are:

• I. Fittig reaction
• II. Wurtz-Fittig reaction
• III. Finkelstein reaction
• IV. Sandmeyer reaction

Also, item D is explicitly given as: $\mathrm{C_2H_5Cl + NaI \to C_2H_5I + NaCl}$ This is a halogen exchange reaction of alkyl chloride with sodium iodide, which is the Finkelstein reaction.

Hence, $D \to III$

Use this to eliminate options

Check which options assign $D \to III$:

• Option A: $D \to I$ ❌
• Option B: $D \to III$ ✅
• Option C: $D \to IV$ ❌
• Option D: $D \to I$ ❌

So only Option B survives.

Verify the remaining matches in Option B

Option B says:

• $A \to II$ = Wurtz-Fittig reaction
• $B \to I$ = Fittig reaction
• $C \to IV$ = Sandmeyer reaction
• $D \to III$ = Finkelstein reaction

These are consistent with the standard definitions:

• Wurtz-Fittig reaction: coupling of an aryl halide and an alkyl halide with sodium in dry ether.
• Fittig reaction: coupling of aryl halides with sodium in dry ether.
• Sandmeyer reaction: replacement of diazonium group by $\mathrm{Cl}$, $\mathrm{Br}$, or $\mathrm{CN}$ using cuprous salts.
• Finkelstein reaction: halogen exchange, typically $\mathrm{RCl/RBr + NaI \to RI}$ in acetone.

Therefore the correct matching is exactly Option B.

Final answer

$\boxed{\text{B}}$