Which cleavage takes place in hydrogenation
Correct answer: A. Pi bonds
- A. Pi bonds
- B. Sigma bonds
- C. None of these
- D. Both of these
Explanation
In hydrogenation, the cleavage primarily occurs in pi bonds as hydrogen molecules are added across unsaturated hydrocarbons, forming single sigma bonds. Sigma bonds remain intact during this process. Option B is incorrect because sigma bonds are not cleaved. Option C is incorrect as pi bonds are cleaved. Option D is incorrect as only pi bonds are involved, not sigma bonds.
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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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