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Ozonolysis of Aromatics

H2SO4 is not ...

Question

H2SO4 is not used during reaction of alcohols with KI because H2SO4 oxidizes HI to I2. But why this does not happen when H2SO4 react with KBr? Also why H3PO4 not used with KBr?

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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. Concentrated

H_{2} S O_{4}

cannot be used to prepare HBr or HI from KBr or KI because it

Q. Explain the following with reasons:
(i) Chlorine displaces iodine from

K I

solution but iodine does not displace bromine from

K B r

solution. Why?
(ii)

H g + H_{2} S O_{4} \to H g S O_{4} + H_{2}

Above reaction is not possible.

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

Q. The metal which does not react with water or dilute

H_{2} S O_{4}

but reacts with concentrated

H_{2} S O_{4}

(A l / C u / Z n / F e)

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