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

Solution

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.

Some More Questions From Haloalkanes and Haloarenes Chapter

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Haloalkanes And Haloarenes

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

Some More Questions From Haloalkanes and Haloarenes Chapter

Write structures of different dihalogen derivatives of propane.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:

i) A single monochloride.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:

i)Three isomeric monochlorides.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:
Four isomeric monochlorides.

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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Haloalkanes And Haloarenes

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

Some More Questions From Haloalkanes and Haloarenes Chapter

Write structures of different dihalogen derivatives of propane.

Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields:i) A single monochloride.

Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields:i)Three isomeric monochlorides.

Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields:Four isomeric monochlorides.

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Draw the structures of major monohalo products in each of the following reactions:

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:

i) A single monochloride.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:

i)Three isomeric monochlorides.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields:
Four isomeric monochlorides.