Question #b135f

1 Answer
Sep 3, 2015

An inductive effect is transmitted through the σ bonds; an electromeric effect is transmitted through π electrons.

Explanation:

An inductive effect is the effect on electron density in one portion of a molecule caused by electron-withdrawing or electron-donating groups elsewhere in the molecule.

For example, an electronegative halogen atom withdraws electron density from other parts of the molecule through the σ bonds.

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The IUPAC defines an electromeric effect as the movement of electrons from one atom through a π system, as indicated by the curved arrows.

goldbook.iupac.org

The IUPAC considers the term "electromeric effect" to be obsolete. The preferred term is "substituent resonance effect"