Define resonance in the context of aromatic compounds, and explain the role of resonance structures in the biosynthesis of lignin. Differentiate between aliphatic and aromatic organic compounds, and...

Define resonance in the context of aromatic compounds, and explain the role of resonance structures in the biosynthesis of lignin.

Differentiate between aliphatic and aromatic organic compounds, and explain the phenomena of resonance structures in aromatic compounds.