In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti-Markovnikov's addition to alkenes because:
Correct answer: C. One of the steps in the free radical mechanism is endothermic
- A. Both are highly ionic
- B. One is oxidizing and the other is reducing
- C. One of the steps in the free radical mechanism is endothermic
- D. All the steps are exothermic in both cases
Explanation
The anti-Markovnikov addition proceeds via a fraa-radical mechanism. For HCI and Hl, one of the chain propagation steps is highly endothermic and thus energetically unfavorable. This prevents the free-radical chain reaction. from proceeding effectively.
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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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