Question

Explain the o, p-directive effect of methyl group.

Answer 1

• All ortho and para directing groups possess nonbonding electron pair on the atom which is directly attached to the aromatic ring; however, methyl group is an exception. 
• Methyl (or alkyl groups) is ortho and para directing, although it has no nonbonding electron pair on the key atom. This is explained on the basis of special type of resonance called hyperconjugation or no bond resonance.

Answer 2

Inductively the methyl group releases electron density into the benzene ring.