Rank the following compounds in order of decreasing reactivity in an electrophilic aromatic subs

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Rank the following compounds in order of decreasing...

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Key Concepts

Directing Effects

Besides influencing reactivity, substituents also direct incoming electrophiles to particular positions on the aromatic ring (ortho, meta, or para). While not directly used for ranking overall reactivity, understanding this concept is essential in predicting the outcome of electrophilic aromatic substitution reactions.

Activating and Deactivating Groups

Activating groups, which donate electrons to the aromatic ring, increase its reactivity towards electrophilic substitution, whereas deactivating groups, which withdraw electrons, decrease such reactivity. The strength and nature of these groups determine the overall reactivity ranking in the substitution reaction.

Substituent Effects

In aromatic compounds, substituents on the ring influence the reactivity toward electrophilic aromatic substitution. Their effects are primarily due to their ability to donate or withdraw electrons via resonance or inductive mechanisms, affecting the electron density of the aromatic system.

Electrophilic Aromatic Substitution (EAS)

This is a fundamental reaction mechanism where an aromatic ring undergoes substitution by an electrophile, replacing one of the hydrogen atoms. The reaction involves the temporary loss of aromaticity, forming a cationic intermediate (the sigma complex), and subsequent re-aromatization of the ring.

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