Chemistry - GOC Question with Solution | TestHub
ChemistryGOCAromaticityMedium2 minQB
ChemistryMediumsingle choice
Using the polygon rule, planar cyclobutadiene has 4 π electrons. Which statement about its MO filling is correct ?
Options:
Answer:
A
Solution:
The polygon rule for a square gives 1 + 2 + 1 MOs : one lowest bonding MO, two degenerate non-bonding MOs and one antibonding MO. 4 electrons fill the lowest MO (2) and leave 2 electrons for the two degenerate non-bonding MOs. By Hund's rule they go one in each (unpaired), so the planar form is unstable (anti-aromatic).
Stream:JEESubject:ChemistryTopic:GOCSubtopic:Aromaticity
⏱ 2mℹ️ Source: QB
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