Paper 2 Exam Questions
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Explain why in electrophilic addition, one product forms in much greater quantity than the other.
The major product is the more stable carbocation And the intermediate formed is a tertiary carbocation which is the most stable as the carbocation is bonded to more carbon atoms
Describe, in terms of orbital overlap, the similarities and differences between the bonding in the Kekulé model and the delocalised model of benzene.
Similarities: both involve the sideways overlap of p-orbitals, and both have pi bonds Differences: kekule has alternating pi bonds, whereas the delocalised model has a pi ring system
Describe two pieces of evidence to support the delocalised model of benzene.
Enthalpy change of hydrogenation is less endothermic than expected Benzene is less reactive than alkenes (undergoes electrophilic addition less readily) All the carbon carbon bonds are the same length
What is meant by heterolytic fission.
One atom receives both electrons And a covalent bond is broken