Which one of the following molecule is less reactive towards electrophilic aromatic substitution?

Explanation:

• Amino, hydroxyl and methyl groups are electron releasing groups. They increase the electron density on the benzene ring. 
• Aniline, phenol and toluene are more reactive towards electrophilic aromatic substitution reaction than nitrobenzene.

• Nitro group is an electron-withdrawing group. It removes electron density from the aromatic nucleus.
• The reactivity of nitrobenzene towards electrophilic aromatic substitution reaction is less.

So, Nitrobenzene molecule is less reactive towards electrophilic aromatic substitution.