Which is the only alcohol that can be prepared by the indirect hydration of alkene?

Ethyl alcohol

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Propyl alcohol

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Isobutyl alcohol

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Methyl alcohol

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Solution

The correct option is A Ethyl alcohol
Alkene is treated with sulfuric acid to give alkyl sulphate esters. In the case of ethanol production, this step can be written:

$H_{2} S O_{4} + C_{2} H_{4} \to C_{2} H_{5} - O - S O_{3} H$

Subsequently, this sulphate ester is hydrolyzed to regenerate sulphuric acid and release ethanol:

$C_{2} H_{5} - O - S O_{3} H + H_{2} O \to H_{2} S O_{4} + C_{2} H_{5} O H$

This two step route is called the "indirect process".
Only in case of ethane it will produce ethyl alcohol while in case of other alkenes product is according to $M a r k o v n i k o v^{'} s R u l e$ .
Methyl alcohol can't be produced by indirect hydration of alkene.

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