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In the presence of sulphuric acid (H2SO4), KI produces HI

Since is an oxidizing agent, it oxidizes HI (produced in the reaction to I2).

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. Instead, a non-oxidizing acid such as H3PO4 is used.

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