Chemistry - GOC Question with Solution | TestHub
ChemistryGOCAromaticityMedium2 minQB
ChemistryMediumsingle choice
Why is the barrier to rotation about the exocyclic double bond in the following compound unusually low ?
Options:
Answer:
D
Solution:
The five-membered ring pulls electron density, so the dipolar form has a cyclopentadienide ring (6π, aromatic) and a ( cation that is stabilised by both phenyl rings. The exocyclic bond is then largely a single bond, so rotation about it is easy.
Stream:JEESubject:ChemistryTopic:GOCSubtopic:Aromaticity
⏱ 2mℹ️ Source: QB
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