SELECT * FROM question_mgmt as q WHERE id=1960 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=65 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th chemistry Haloalkanes and Haloarenes why is sulphuric acid not used during the reaction

Question:

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

Answer:

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.


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