FRAR · Addition95 slides

Free Radical Addition Reactions

Curriculum Module FRAR

Free Radical Addition Reactions

Peroxide Effect, Kharasch Addition of HBr & Radical Polymerization

95 SlidesFull Master Compendium

Core Mechanistic Pathways

Three-step radical cascade: Initiation, Propagation 1 & 2, Termination
Thermodynamics: Why only HBr shows the Peroxide Effect (and not HCl or HI)
Radical stability hierarchy: 3° > 2° > 1° > methyl, allylic/benzylic resonance
Anti-Markovnikov addition of HBr across asymmetric alkenes
Polymerization: Initiation with benzoyl peroxide (AIBN, BPO)
Free radical chain transfer and disproportionation termination

Key Reagents & Conditions

HBr / Benzoyl Peroxide (PhCOO)₂hv / light or Δ (heat)AIBN (Azobisisobutyronitrile)

Stereochemical Dynamics

Planar radical intermediate yielding racemic mixtures unless directed by existing chiral centers.

Module Summary & Study Guidance

Comprehensive breakdown of radical addition energetics. Includes bond dissociation energy (BDE) calculations, exothermic vs endothermic propagation steps, and anti-Markovnikov regiochemistry.

Exam Orientation: JEE Main & Advanced · Alkene traps and thermodynamic hurdles. All materials are embedded directly on Chem-Mantra with online presentation and secure reference reading modes.

Curriculum Module FRAR

Free Radical Addition Reactions

Peroxide Effect, Kharasch Addition of HBr & Radical Polymerization

95 SlidesFull Master Compendium

Core Mechanistic Pathways

Three-step radical cascade: Initiation, Propagation 1 & 2, Termination
Thermodynamics: Why only HBr shows the Peroxide Effect (and not HCl or HI)
Radical stability hierarchy: 3° > 2° > 1° > methyl, allylic/benzylic resonance
Anti-Markovnikov addition of HBr across asymmetric alkenes
Polymerization: Initiation with benzoyl peroxide (AIBN, BPO)
Free radical chain transfer and disproportionation termination

Key Reagents & Conditions

HBr / Benzoyl Peroxide (PhCOO)₂hv / light or Δ (heat)AIBN (Azobisisobutyronitrile)

Stereochemical Dynamics

Planar radical intermediate yielding racemic mixtures unless directed by existing chiral centers.

Module Summary & Study Guidance

Comprehensive breakdown of radical addition energetics. Includes bond dissociation energy (BDE) calculations, exothermic vs endothermic propagation steps, and anti-Markovnikov regiochemistry.

Exam Orientation: JEE Main & Advanced · Alkene traps and thermodynamic hurdles. All materials are embedded directly on Chem-Mantra with online presentation and secure reference reading modes.