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How can you obtain iodoethane from ethanol when no other iodine containing reagent except NaI is available in the laboratory? |
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Answer» Solution :First convert ethanol to chloroethane on treatment with HCl (g) and anhyd. `ZnCl_(2)` ((or bromoethane on treatment with `P+Br_(2)`) and then to iodoethane on treatment with NAI in acetone by Finkelstein reaction. `UNDERSET("Ethanol")(CH_(3)CH_(2)OH)+HCl OVERSET("Anhyd. "ZnCl_(2))to underset("Chloroethane")(CH_(3)CH_(2)Cl+H_(2)O` `underset("Ethanol")(CH_(3)CH_(2)OH)overset(P+Br_(2))to underset("Bromoethane")(CH_(3)CH_(2)Br)` `underset("Chloroethane")(CH_(3)CH_(2)Cl) " or"underset("Bromoethane")(CH_(3)CH_(2)Br)+NaI underset(("Finkelstein reaction"))overset("Acetone")to underset("Iodoethane")(CH_(3)CH_(2)I)+NaCl " or"NaBr` |
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