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Organic Chemistry

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31 Oct 2007 17:41:26 IST

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Markownikoff's Rule

None

if the reaction of any unsymmetrical carbon compound is carried in presence of peroxide,

e.g.-CH3-CH=CH2+HBr

then the product formed contains only 1-bromopropane

But in the absence of peroxide,why 1-bromopropane is also formed if we are considering Markownikoff's rule.Because it is given in a book which i refer that in absence of peroxide,the product which we get contains approximately 90% of 2-bromopropane and 10% of 1-bromopropane?

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Nadeem

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Joined: 25 Aug 2007

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31 Oct 2007 18:19:29 IST

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Markovnikov 's rule states that in the absence of peroxide, 2-bromopropane will be the major product. It does not mention that it will be the only product . What is written in the buk is right.

arun-rashi

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Joined: 19 Oct 2006

Posts: 1057

1 Nov 2007 07:49:09 IST

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in presence of peroxide there is free radical addition reaction ouccrs so major is 1-bromopropane by intermediate free radical stability but in absence of peroxide ionic electrophilic addition so major is 2-bromopropane and minor 1-bromo product.

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