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( please give me the ans or explanation on them ) Halogen acid molecular sites HF, HCl , HBr and HI . Now, among the four halogen acid why anti markovnikov rule is shown only by HBr ?

Posted by Arnab H. 3 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Prachi Agarwal 3 years, 6 months ago

The bond strength order of halogen acid is . HF and HCl have high bond strength and polarity, so homolytic cleavage does not occur easily. In HBr and HI, homolytic clevage occurs readily to produce bromine and iodine free radicals. However, iodine radicals undergo coupling reaction with similar iodine radical to form iodine molecule.
As a result radicals are not available for addition on alkenes. Thus, only HBr can provide free radical for addition to alkenes. Thus ,this rule is only applicable to HBr

1Thank You

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