Question:
Anti-Markownikoff's rule addition reaction is not observed in the following compound.
Anti-Markownikoff's rule addition reaction is not observed in the following compound.
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Anti-Markovnikov addition (peroxide effect) is observed only with unsymmetrical alkenes and HBr.
Updated On: Apr 16, 2026
- propene
- 1-butene
- but-2-ene
- pent-2-ene
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Anti-Markovnikov addition (e.g., using HBr in the presence of peroxides) occurs with unsymmetrical alkenes where the addition of HBr gives the product with Br at the less substituted carbon. For symmetrical alkenes, both addition modes give the same product.
Step 2: Detailed Explanation:
Anti-Markovnikov addition is observed with unsymmetrical alkenes. If the alkene is symmetrical (like but-2-ene or pent-2-ene), the two possible addition products are identical. Therefore, one cannot say that "Anti-Markovnikov rule" is observed or not, as it yields the same product as Markovnikov addition. However, the question likely tests that for symmetrical alkenes, the distinction between Markovnikov and anti-Markovnikov addition is not apparent. More specifically, the peroxide effect is not observed for symmetrical alkenes like but-2-ene. Propene and 1-butene are unsymmetrical and show the effect.
Step 3: Final Answer:
Anti-Markovnikov addition is not observed in but-2-ene, which corresponds to option (C).
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