Chemistry - Hydrocarbon Question with Solution | TestHub
Reaction incorrectly matched with its major product is :
Options:
Answer:
Solution:
Question Explanation: Identify which of the provided chemical reactions is incorrectly matched with its major product
Concept: This is based on Electrophilic Addition, Carbocation Rearrangement and Peroxide Effect (Kharasch Effect).
Solution:
1. In reaction 1, the addition of HBr to 3-methylbut-1-ene forms a secondary carbocation which
undergoes a 1,2-hydride shift to form a more stable tertiary carbocation.
The major product should be 2-bromo-2-methylbutane, making the given product in option 1 incorrect.
2. Acid-catalyzed hydration of 3-methylbut-1-ene involves a secondary carbocation that undergoes a 1,2-hydride shift to form a stable tertiary carbocation, correctly yielding 2-methylbutan-2-ol.
3. In the presence of peroxides (ROOR), HBr adds via a free-radical mechanism (Anti-
Markovnikov), where the bromine radical attacks the less substituted terminal carbon, correctly
yielding 1-bromo-3-methylbutane.
Final Answer: Option (A)