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Haloalkanes and Haloarenes
Question
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Why is sulphuric acid not used during the reaction of alcohols with KI?

Answer

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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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: