Finkelstein reaction is-

2 C H_{3} C H_{2} C l + A g_{2} O (d r y) \to C H_{3} C H_{2} O C H_{2} C H_{3} + 2 A g C l

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C H_{3} C H_{2} B r + N a I A c e t o n e - ---- \to C H_{3} C H_{2} I + N a B r

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C H_{3} C H_{2} B r + A g_{2} O (m o i s t) \to C H_{3} C H_{2} O H + A g B r

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C H_{3} C H_{2} C l + N a O C H_{3} \to C H_{3} C H_{2} O C H_{3} + N a C l

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Solution

The correct option is B $C H_{3} C H_{2} B r + N a I A c e t o n e - ---- \to C H_{3} C H_{2} I + N a B r$
Finkelstein reaction is halogen exchange reaction in which more reactive alkanes replaces less reactive halogens(lower) in alkyl halides following $S_{N} 2$ pathway in acetone solvent.

$C H_{3} C H_{2} B r + N a I A c e t o n e - ---- \to C H_{3} C H_{2} I + N a B r$
Hence, (b) is correct.

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