Matching Organic Reactions with Their Respective Reagents

To determine the correct matching between the named reactions in List-I and the corresponding reagents/catalysts in List-II, we analyze each reaction individually:

1. A. Finkelstein reaction:

   • This is a halogen exchange reaction used to synthesize alkyl iodides from alkyl chlorides or alkyl bromides by reacting them with sodium iodide ($\text{NaI}$) in dry acetone.
   • Equation: $\text{R}-\text{X} + \text{NaI} \xrightarrow{\text{dry acetone}} \text{R}-\text{I} + \text{NaX} \quad (\text{X} = \text{Cl, Br})$
   • Therefore, A matches with III.

2. B. Swarts reaction:

   • This reaction is used for the synthesis of alkyl fluorides by heating alkyl chlorides or bromides in the presence of metallic fluorides such as antimony trifluoride ($\text{SbF}_3$), silver fluoride ($\text{AgF}$), or cobalt fluoride ($\text{CoF}_2$).
   • Equation: $3\text{R}-\text{Cl} + \text{SbF}_3 \rightarrow 3\text{R}-\text{F} + \text{SbCl}_3$
   • Therefore, B matches with I.

3. C. Sandmeyer's reaction:

   • This reaction is used to convert benzene diazonium salts into haloarenes using cuprous salts such as cuprous chloride ($\text{Cu}_2\text{Cl}_2$) or cuprous bromide ($\text{Cu}_2\text{Br}_2$) in the presence of the corresponding halogen acid.
   • Equation: $\text{Ar}-\text{N}_2^+\text{Cl}^- \xrightarrow{\text{Cu}_2\text{Cl}_2/\text{HCl}} \text{Ar}-\text{Cl} + \text{N}_2$
   • Therefore, C matches with IV.

4. D. Fittig reaction:

   • This reaction involves the coupling of two molecules of aryl halides in the presence of sodium metal and dry ether to form diaryl compounds (such as biphenyl).
   • Equation: $2\text{Ar}-\text{X} + 2\text{Na} \xrightarrow{\text{dry ether}} \text{Ar}-\text{Ar} + 2\text{NaX}$
   • Therefore, D matches with II.

Thus, the correct matching is: $\text{A-III, B-I, C-IV, D-II}$

This corresponds to Option B.