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Directive Influence of Substituents

Consider the ...

Question

Consider the following list of regents:
$C u^{2 +}, c o n c . H_{2} S O_{4}, C l_{2}, (H N O_{2} + C H_{3} C O O H), A g N O_{3}$
The total number of reagents that can oxidize aqueous iodide to iodine is

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Solution

$2 I^{-} + C u^{2 +} \to \frac{1}{2} I_{2} + C u I ↓ 2 N a I + 2 H_{2} S O_{4} \to N a_{2} S O_{4} + S O_{2} + 2 H_{2} O + I_{2} 2 N a I + C l_{2} \to 2 N a C l + I_{2} 2 H N O_{2} + 2 K I + C H_{3} C O O H \to 2 C H_{3} C O O K + 2 H_{2} O + 2 N O + I_{2} N a I + A g N O_{3} \to A g I + N a N O_{3}$

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