Class 11 Chemistry simulations · Hydrocarbons

Markovnikov and anti-Markovnikov addition

Add HBr to propene with or without peroxide and see where the bromine ends up.

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What to notice

Without peroxide H adds to the carbon that already has more H atoms (via the more stable 2° carbocation); peroxide reverses this by a free-radical path (Kharasch effect).

Key relation

CH₃–CH=CH₂ + HBr → CH₃–CHBr–CH₃ (Markovnikov) ; with peroxide → CH₃–CH₂–CH₂Br

Try this

Switch on peroxide. Which product forms now?

What you can change

• Conditions: choose HBr alone, HBr + peroxide
• Progress: 0 to 100 %

More in Hydrocarbons

• Benzene: resonance and equal bonds
• Conformations of ethane

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