Chapter 26, Problem 26.28AP

Interpretation Introduction

Interpretation:

The increasing order of reactivity toward nitration with ${\text{HNO}}_{\text{3}}$ of the compounds, thiophene, benzene, $3-$ methylthiophene and $2-$ methylfuran is to be stated with explanation.

Concept introduction:

Electrophilic substitution reactions are those reactions in which an electrophile replaces the atom or functional group of a compound.

Resonance is a phenomenon in which polarity is generated in a molecule by the interaction of the conjugated $\pi \text{-}$ bonds or by interaction of the lone pair of electrons and $\pi \text{-}$ bonds. In this phenomenon, the delocalization of the lone pair of electrons occurs. More the resonating structures of a compound, more stable is the compound.