PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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Solution - Why is Sulphuric Acid Not Used During the Reaction of Alcohols with KI? - PUC Karnataka Science Class 12 - Chemistry

Question

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

Solution

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

`2KI + H_2SO_4 -> 2KHSO_4 + 2HI`

Since `H_2SO_4` is an oxidizing agent, it oxidizes HI (produced in the reaction to I2).

`2HI + H_2SO_4 -> I_2 + SO_2  + H_2O`

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 H3POis used.

 

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APPEARS IN

 NCERT Chemistry Textbook for Class 12 Part 2 (with solutions)
Chapter 10: Haloalkanes and Haloarenes
Q: 2 | Page no. 289

Reference Material

Solution for question: Why is Sulphuric Acid Not Used During the Reaction of Alcohols with KI? concept: null - Nomenclature. For the courses PUC Karnataka Science, CBSE (Science)
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