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Chemistry · 2025 · 2 marks
CBSE 2025 · Region 5 · Set 1 · Q20
Explain the mechanism of acid catalysed hydration of ethene.
Explain the mechanism of acid catalysed hydration of ethene.
Marking-scheme solution
The mechanism of the reaction involves the following three steps:Step $\displaystyle 1$: Protonation of alkene to form carbocation by electrophilic attack of $\displaystyle H_3O^+$.\[H_2O + H^+ \rightarrow H_3O^+ \]
Step $\displaystyle 2$: Nucleophilic attack of water on carbocation.
Step $\displaystyle 3$: Deprotonation to form an alcohol.
Step $\displaystyle 2$: Nucleophilic attack of water on carbocation.Step $\displaystyle 3$: Deprotonation to form an alcohol.All Alcohols, Phenols and Ethers questions2025 question paperNCERT solutions: Alcohols, Phenols and EthersPractice Alcohols, Phenols and Ethers →
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.