COMEDK2024Morning ShiftChemistryGeneral Organic ChemistryActual
Given below are 4 species with one odd electron on the Carbon atom. array ll A = ( CH ₃ )₃ C & B = ( C ₆ H ₅ )₃ C C = ( C ₆ H ₅ )₂ C H & D = ( CH ₃ )₂ C H array Choose the correct decreasing order of stability of the species.
Options
- AA > B > D > C
- BD > A > C > B
- CA > B > C > D
- DB > C > A > D
Correct answer
D. B > C > A > D
Step-by-step solution
The stability of free radicals is primarily determined by resonance stabilization and hyperconjugation. The species are: A: ( CH ₃)₃ C (tert-butyl radical) - stabilized by 9 hyperconjugative hydrogens. B: ( C ₆ H ₅)₃ C (triphenylmethyl radical) - stabilized by extensive resonance with three phenyl rings. C: ( C ₆ H ₅)₂ C H (diphenylmethyl radical) - stabilized by resonance with two phenyl rings. D: ( CH ₃)₂ C H (isopropyl radical) - stabilized by 6 hyperconjugative hydrogens. Comparing the stabilization effects, re