Chemistry - GOC Question with Solution | TestHub
ChemistryGOCRESONANCE AND MESOMERIC EFFECTMedium2 minQB
ChemistryMediumsingle choice
Are the two structures shown below (a benzocyclobutene and its o-quinodimethane) resonance forms of one another ?

Options:
Answer:
A
Solution:
In the quinodimethane the four-membered ring has been opened : a sigma bond is broken. Resonance forms differ only in pi electron and lone-pair positions, with all atoms and sigma bonds unchanged. The two structures are isomers.
Stream:JEESubject:ChemistryTopic:GOCSubtopic:RESONANCE AND MESOMERIC EFFECT
⏱ 2mℹ️ Source: QB
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