Question

Which of the following alcohols is NOT prepared by acid-catalyzed hydration of alkenes?

• A. Ethanol
• B. Propan-2-ol
• C. Propan-1-ol
• D. 2-Methyl propan-2-ol

Hint:

Acid-catalyzed hydration of alkenes follows Markovnikov’s rule, where the hydroxyl group adds to the more substituted carbon.

Answer 1

The Correct Option is C

Step 1: Identifying the preparation method.
Acid-catalyzed hydration of alkenes typically results in the formation of alcohols where the hydroxyl group (-OH) adds to the more substituted carbon. This leads to the formation of the Markovnikov product.
Step 2: Analyzing the options.
(A) Ethanol: Ethanol is formed by acid-catalyzed hydration of ethene.
(B) Propan-2-ol: Propan-2-ol is formed by acid-catalyzed hydration of propene.
(C) Propan-1-ol: Incorrect — Propan-1-ol is not the product of acid-catalyzed hydration of alkenes, as it would be the anti-Markovnikov product, which requires a different mechanism.
(D) 2-Methyl propan-2-ol: This is formed by acid-catalyzed hydration of isobutene.
Step 3: Conclusion.
The correct answer is (C) Propan-1-ol.