In which addition reaction Markownikov's rule is not obeyed:
Correct answer: D. CH3CH=CHCH3 + HBr→
- A. CH3CH=CH2 + HCl →
- B. CH3CH2CH=CH2+ HI→
- C. CH3CH=CH2 + HBr→
- D. CH3CH=CHCH3 + HBr→
Explanation
Markownikov's rule is generally followed in addition reactions, where the hydrogen atom attaches to the carbon with more hydrogen atoms. Option D is correct because in the presence of peroxides, HBr addition to unsymmetrical alkenes like CH3CH=CHCH3 does not follow Markownikov's rule due to the radical mechanism. The other options are incorrect because they either follow Markownikov's rule or require specific conditions to deviate from it.
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Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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