Question

What do you meant by Markownikov's rule? Write mechanison of the reaction.
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Answer 1

Answer:

According to Markovnikov's Rule when hydrogen halide or protic acid (HX) is added to an asymmetric alkene, the acid hydrogen gets attached to the carbon with more hydrogen substituents and halide group gets attached to the carbon with a greater number of alkyl substituents.

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Answer 2

Answer:

Markovnikov's rule:

In an addition reaction of a protic acid HX (hydrogen chloride, hydrogen bromide, or hydrogen iodide) to an alkene or alkyne, the hydrogen atom of HX becomes bonded to the carbon atom that had the greatest number of hydrogen atoms in the starting alkene or alkyne.

In the absence of a peroxide, HBr adds to propene via an ionic mechanism (with a carbocation intermediate) to give 2-bromopropane. Markovnikov's Rule is obeyed.