Which of the following is not an ortho-para director in electrophilic aromatic substitution?

Understand the Problem

The question is asking which functional group among the given choices does not act as an ortho-para director in the context of electrophilic aromatic substitution reactions.

More Information

In electrophilic aromatic substitution, groups like -SO3H are meta-directors because they withdraw electron density, favoring substitution at the meta position.

Tips

A common mistake is thinking that all electron-withdrawing groups are meta directors; however, electronegativity can also lead to ortho-para directing if it's not too strong.

Sources

• Ortho-, Para- and Meta- Directors in Electrophilic Aromatic Substitution - masterorganicchemistry.com