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Write the mechanism of acid catalysed de...

Write the mechanism of acid catalysed dehydration of ethanol to ethene.

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The mechanism of acid catalysed dehydration of ethanol to ethene follows the following steps
Step-1 : Protonation of alcohol.
Concentrated sulphuric acid protonates ethyl alcohol to form ethyloxonium ion (Protonated alcohol)

Step-2: Formation of Carbocation
The oxonium ion formed loses stable water molecule to form a carbocation. This is the slowest step of the mechanism hence is the rate determining step.

Step-3 : Elimination of proton to form Ethene. The carbocation formed loses a proton to form the final product ethene.
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