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 step is endothermic in both the cases
- A. Both are highly ionic
- B. One is oxidising and the other is reducing
- C. One of the step is endothermic in both the cases
- D. All the steps are exothermic in both the cases
Explanation
HI and HCl do not do this for energetic reasons. The addition of Cl and I radicals to alkanes in an anti-Markovnikov fashion is an endothermic reaction and therefore counterproductive. Without the presence of peroxide, all hydrogen halides will add according to the Markovnikov rule.
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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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