Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene.
The mechanism of acid dehydration of ethanol to yield ethene involves the following three steps:
Protonation of ethanol to form ethyl oxonium ion:
Formation of carbocation (rate determining step):
Elimination of a proton to form ethene:
The acid consumed in step 1 is released in Step 3. After the formation of ethene, it is removed to shift the equilibrium in a forward direction.