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Preparation of Carboxylic Acids from Hydrocarbons

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Question

why is H₂SO₄ not used during the reaction of alcohols with KI?

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Solution

In the presence of sulphuric acid (H2SO4), KI produces HI
Since is an oxidizing agent, it oxidizes HI (produced in the reaction to I2).
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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Q. Statement I :

H_{2} S O_{4}

is not used during the reaction of alcohols with

K I

.
Statement II :

H_{2} S O_{4}

K I

I_{2}

and will prevent reaction of alcohol with

K I

.

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

H_{2} {S O}_{4}

cannot be used along with KI in the conversion of an alcohol to an alkyl iodide?

Q. Explain why dehydration of alcohols to form alkenes is always carried out with conc.

H_{2} S O_{4}

, and not with conc.

H C l

H N O_{3}

H_{2} S O_{4}

can not be used to prepare HI from KI as ____________.

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