Haloalkanes and Haloarenes

Short Answer Type

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Why is sulphuric acid not used during the reaction of alcohols with KI?

H2SO4 cannot be used along with KI in the conversion of an alcohol to an alkyl iodide as it oxidizes KI in the presence of sulphuric acid (H2SO4) to corresponding HI and then to I2 i.e.,

KI produces HI, In the presence of sulphuric acid (H2SO4).
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. Instead, a non-oxidiznig acid such H3PO4 is used.

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