Question

Why ia aulphuric acid dowa mot during the teaxtin of alchoks with koh?

Answer 1

In the presence of H2SO4 KI produces HI

KI + H2SO4 gives HI + KHSO4

Also H2SO4 acts as oxidizing agent

HI + H2SO4 gives I2

Thus reaction of KI with alcohol to produce alkyl iodide cannot occur.

Therefore sulfuric acid is not used during the reaction of KI with Alcohol.

Instead we can use non-oxidizing acid such as H3PO4

Answer 2

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

hope helps ☺️☺️