Unsubstituted benzoic acid lacks resonance due to steric effects
The claim that unsubstituted benzoic acid lacks resonance due to steric effects is scientifically incorrect, as benzoic acid is a classic example of a resonance-stabilized aromatic system.
Unsubstituted benzoic acid does not suffer from steric inhibition of resonance because there are no bulky ortho substituents to twist the carboxyl group out of the plane of the benzene ring. Standard chemical texts and studies on benzoic acid confirm it possesses normal resonance structures.
Shu-kun Lin, Jerry March. March's Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 5th Edition. 2001. https://doi.org/10.3390/61201064
Standard organic chemistry principles establish that unsubstituted benzoic acid exhibits significant resonance stabilization involving the aromatic ring and the carboxyl group.
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Susanta K. Sen Gupta, Ruchi Shrivastava. Solvent sensitivity of <i>ortho</i> substituent effect on <sup>13</sup>C NMR chemical shift of the carboxyl carbon (<i>δ</i><sub>co</sub>) in benzoic acid. 2011. https://doi.org/10.1002/mrc.2802
Studies examining substituent and steric effects on benzoic acid derivatives demonstrate that unsubstituted benzoic acid possesses standard aromatic resonance features which are modulated rather than absent.
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