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Question
How can you obtain iodoethane from ethanol when no other iodine-containing reagent except NaI is available in the laboratory?
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Solution
Ethanol is converted to chloroethane and Cl can be replaced by I.
\[\ce{C2H5OH + HCl ->[ZnCl2] C2H5Cl ->[NaI] C2H5I}\]
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