BITSAT2024ChemistryGeneral Organic ChemistryActual
Choose the correct stability order of the given free radicals.
Options
- AI > II > III > IV
- BII > I > IV > III
- CII = I > IV > III
- DIII > IV > II > I
Correct answer
B. II > I > IV > III
Step-by-step solution
In compounds (I), (III) and (IV) the -M effect and hyperconjugation effect are inoperative at meta positions. So we should consider the inductive effect of the groups. -I effect will decrease the stability of the free radical by withdrawing the electrons toward it itself. The order of -I effect is ( NO ₂> CN > OH ). Therefore (III) is most destabilised. In compound (II) the OH act as electron donating group through +M effect which is operative at para position. This increase the electron density at para position an