In which of the following, anti Markovnikov addition of $H B r$ is not observed?

propene

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but-1-ene

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but-2-ene

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pent-2-ene

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Solution

The correct option is D but-2-ene
In 2-butene, Anti Markovnikov addition of HBr is not observed as it is a
symmetric alkene

$C H_{3} - C H = C H - C H_{3}$ .

In case of symmetrical alkene this rule is not applicable.

Option C is correct.

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