Why Sulphuric acid is not used …
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Posted by Damter Bomnyo 8 years, 1 month ago
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Amar Kumar 8 years, 1 month ago
In the presence of sulphuric acid (H2SO4), KI produces HI
2KI + H2SO4 → 2KHSO4 + 2HI
Since H2SO4 is an oxidizing agent, it oxidizes HI (produced in the reaction to I2).
2HI + H2SO4 → I2 + SO2 + H2O
As a result, the reaction between alcohol and HI to produce alkyl iodide cannot occur. Therefore, sulphuric acid is not used during the reaction of alcohols with KI. A non-oxidizing acid such as H3PO4 is used.
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