Question:

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

Updated On: Jul 26, 2024

$-NO_2$
$-C = N$
$-SO_3 H$
$ -COOH$

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The Correct Option is A

Solution and Explanation

Deactivating power :
${ - NO_2 > -C \equiv N > - SO_3 H > COOH}$

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Concepts Used:

Aromatic hydrocarbon

Aromatic hydrocarbons, sometimes known as arenes, are aromatic organic molecules made up entirely of carbon and hydrogen. In aromatic compounds a benzene ring which is named after the simple aromatic chemical benzene, or a phenyl group when part of a larger structure, is the configuration of six carbon atoms.

Read More: Aromaticity

Reactions of Aromatic Hydrocarbons:

1. Aromatic Substitution Reactions

This reaction involves the replacement of one substituent on the ring of an aromatic hydrocarbon, commonly a hydrogen atom, by a different substituent group.

The common types of aromatic substitution reactions are:

Nucleophilic aromatic substitution reactions
Electrophilic aromatic substitution reactions
Radical nucleophilic aromatic substitution reactions

2. Coupling Reactions

In these types of reactions, the coupling of two fragments that have a radical nature is achieved with the help of a metal catalyst