JEE Main · 2026 · 04 Apr 2026 · Shift 1 · Chapter_pending

The Finkelstein reaction converts an alkyl chloride or bromide to the iodide using sodium iodide, so it pairs with NaI. The Swarts reaction introduces fluorine using a metal fluoride such as $\mathrm{SbF}{}_3$, so it pairs with $\mathrm{SbF}{}_3$. The Sandmeyer reaction replaces a diazonium group by chlorine using cuprous chloride, so it pairs with $\mathrm{Cu}{}_2\mathrm{Cl}{}_2$. The Wurtz--Fittig (Fittig) reaction couples aryl and alkyl halides using sodium in dry ether, so it pairs with Na, dry ether. Hence Finkelstein--NaI, Swarts--$\mathrm{SbF}{}_3$, Sandmeyer--$\mathrm{Cu}{}_2\mathrm{Cl}{}_2$ and Fittig--Na, dry ether.