Chemistry - GOC Question with Solution | TestHub
ChemistryGOCRESONANCE AND MESOMERIC EFFECTMedium2 minQB
ChemistryMediumsingle choice
In which of the following molecules, the substituent does not exert its resonance effect?
Options:
Answer:
b
Solution:
The substituent does not show its resonance effect when it has no lone pair available for conjugation with the benzene ring. In C₆H₅N⁺H₃ the positively charged nitrogen has four sigma bonds and no lone pair available for conjugation, so it shows no +R effect (only a -I effect).
The groups -NH₂, -OH and -Cl in (a), (c) and (d) each have a lone pair that is delocalised into the ring (+R effect).
Hence the answer is (b).
Stream:JEESubject:ChemistryTopic:GOCSubtopic:RESONANCE AND MESOMERIC EFFECT
⏱ 2mℹ️ Source: QB
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