Chemistry - GOC Question with Solution | TestHub
ChemistryGOCAromaticityMedium2 minQB
ChemistryMediumsingle choice
The 4 π electrons of the planar cyclopentadienyl cation fill its five π MOs as :
Options:
Answer:
A
Solution:
The five MOs are 1 bonding (lowest), 2 degenerate non-bonding and 2 antibonding (the polygon rule for a pentagon). 4 electrons fill the bonding MO (2) and put one electron in each degenerate non-bonding MO (Hund's rule). The open-shell arrangement is unstable, which is consistent with the negative resonance energy (-43.75 kcal/mol). Anti-aromatic.
Stream:JEESubject:ChemistryTopic:GOCSubtopic:Aromaticity
⏱ 2mℹ️ Source: QB
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