The team's interpretation confines the effect to the bond directly attached to the relevant atom. If its reach is narrower than textbooks suggest, then reactivity explanations built on the older model may also need revision.

What evidence supports the new view?

The researchers did not base the conclusion on a single experiment. They pooled evidence already scattered through the scientific literature and combined it with their own consistent dataset.

"While some data supporting our conclusions is already available within the research literature, it is not widely known," Elliott said. "What we have done is pull all the existing data together, supported by our own coherent data set, to show the generality and teaching implications of this approach."

The collaboration formed after Elliott encountered work by Dr. Edwin Johnson of the University of Newcastle, Australia, and Dr. Kasimir Gregory of the University of New England. Their studies of how electronegative elements affect acidity produced results that did not match textbook descriptions.

"We realized that the discrepancy between modern computational data and textbooks was larger than we had anticipated," Elliott said.

Why challenge a century-old idea?

The researchers hesitated before questioning long-established thinking.

"We didn't initially feel comfortable challenging the established wisdom," Elliott said. "Some of the names associated with the inductive effect are 'legends' of our discipline. We certainly aren't smarter than those pioneers, of course. But we have better tools nowadays."

Modern computational methods allow researchers to examine molecular structures and electron distributions directly. Earlier chemists had to draw indirect conclusions from limited experimental data.

What changes for students and researchers?

The researchers argue that correcting the basics early matters well beyond introductory chemistry.

"If a foundational concept is taught inaccurately, misunderstandings can carry into more advanced science and research," said Dr. Edwin Johnson, a co-author and lecturer at the University of Newcastle, Australia. "By revisiting a long-standing textbook explanation with modern tools, our work aims to improve chemistry education and strengthen the conceptual foundations that support chemical innovation."

Two UK A-level exam boards have already announced reviews of how they teach the inductive effect, citing the research directly. The team hopes its proposed explanation will give students a more consistent framework and provide scientists with a stronger conceptual basis for studying molecular structure and reactivity.

The paper, titled "Rethinking the Nature and Extent of Inductive Effects in Organic Compounds," appears in the Journal of Chemical Education. Co-authors include Mark C. Elliott, Edwin C. Johnson, Kasimir P. Gregory, and Colan E. Hughes.