Anti-Markownikoff's rule addition reaction is not observed in the following compound

propene

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1-butene

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but-2-ene

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pent-2-ene

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Solution

The correct option is C but-2-ene
Anti-Markownikoff's rule for addition reaction is not observed in but-2-ene $C H_{3} - C H = C H - C H_{3}$ as it is symmetrical alkene.
Anti-Markownikoff's rule for addition reaction is observed in but-1-ene $C H_{3} - C H_{2} - C H = C H_{2}$ as it is unsymmetrical alkene.
Similally, propene $C H_{3} - C H = C H_{2}$ and pent-2-ene $C H_{3} - C H = C H - C H_{2} - C H_{3}$ are unsymmetrical alkenes. So for these alkenes, anti-Markownikoff's rule for addition reaction is observed.

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