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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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(a) When sodium phenate is heated with carbon dioxide at 413 K under 6-7 atm pressure followed by acidification with HCl, salicylic acid is formed.

(b) Step 1 : Formation of protonated alcohol :

Step 2 : Formation of carbocation :
`H-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C)-underset(ddot)overset(H)overset(|)(o^(o+))-H overset("Slow")( Step 3: Elimination of proton:
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