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19 Sep 2011 19:15:00 IST

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what is markonioff rule?

Chemistry

what is markonioff rule?

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Vikram Saxena

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Joined: 1 Apr 2007

Posts: 3743

20 Sep 2011 00:35:49 IST

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Markownikoff rule

‘In the addition of hydrogen halides to unsymmetrically constituted [unsaturated]

hydrocarbons, the halogen atom becomes attached to the carbon

bearing the lesser number of hydrogen atoms.’ Originally formulated by

Markownikoff (Markovnikov) to generalize the orientation in additions of

hydrogen halides to simple alkenes, this rule has been extended to polar

addition reactions as follows. ‘In the heterolytic addition of a polar molecule

to an alkene or alkyne, the more electronegative (nucleophilic) atom

(or part) of the polar molecule becomes attached to the carbon atom bearing

the smaller number of hydrogen atoms

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