What is the other name for Anti Markovnikov rule?

Answer:

The Anti Markovnikov rule works against Markovnikov rule and is called as peroxide effect or Kharasch effect.

Anti Markovnikov rule

Anti-Markovnikov rule explains the regiochemistry where the substituent is bonded to a less substituted carbon, rather than the more substituted carbon. This process is quite unusual, as carboncations which are commonly formed during alkene, or alkyne reactions tend to favour the more substituted carbon.
Example:
In the presence of peroxides such as benzoyl peroxide, the addition of HBr but not HCl or HI to unsymmetrical alkenes goes against Markovnikov’s rule.
CH3CH2CH=CH2 + HBr → CH3CH2CH3CH2Br

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