Which of the following compound does not show anti-Markownikoff addition?

Propene

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1-Butene

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2-Butene

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2-Pentene

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Solution

The correct option is A 2-Butene
Anti Markownikoffrule does not apply to symmetrical alkene. It is applicable to addition of unsymmetrical reagent across unsymmetrical double bond.
(a) $C H_{3} - C H = C H_{2} p r o p e n e$ (unsymmetric alkene)
(b) $C H_{3} - C H_{2} - C H = C H_{2} 1 - b u t e n e$ (unsymmetric alkene)
(c) $C H_{3} - C H = C H - C H_{3} 2 - b u t e n e$ (symmetric alkene)
(d) $C H_{3} - C H_{2} - C H = C H_{2} 2 - p e n t e n e$ (unsymmetric alkene)
$∴$ 2-butene will not show anti-markourikoff rule.

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