What is the primary effect of a -CN group on a benzene ring?

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Question: What is the primary effect of a -CN group on a benzene ring?

Options:

Correct Answer: -M effect

Solution:

-CN exhibits a -M effect as it withdraws electron density through resonance.

What is the primary effect of a -CN group on a benzene ring?

What is the primary effect of a -CN group on a benzene ring?

Step 1: Understand what a benzene ring is. It is a circular arrangement of six carbon atoms with alternating double bonds.
Step 2: Learn about the -CN group, which is called a cyano group. It consists of a carbon atom triple-bonded to a nitrogen atom.
Step 3: Recognize that the -CN group can affect the electron density of the benzene ring.
Step 4: Identify that the -CN group has a -M effect, meaning it withdraws electron density from the benzene ring.
Step 5: Understand that this withdrawal happens through a process called resonance, where the electrons are redistributed.

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