E1/E2 Mechanisms

Question 1

E2 Mechanism (Characteristics)

Answer 1

• One-Step Mechanism (Bimolecular)
• Second-Order Kinetics (R=[RX][B:])
• Rate: 3 > 2 > 1 > Methyl
• Anti-periplanar Arrangement of H and X
• Favored by Strong Bases
• Better Leaving Group = Faster Reaction
• Favored by Polar Aprotic Solvents
• More Substituted Alkene Favored

Question 2

E1 Mechanism (Characteristics)

Answer 2

• Two-Step Mechanism (Unimolecular)
• First-Order Kinetics (R=k[RX])
• Rate: 3 > 2 > 1 > Methyl
• Trigonal Planar Carbocation Intermediate
• Favored by Weak Bases
• Better Leaving Group = Faster Reaction
• Favored by Polar Protic Solvents
• More Substituted Alkene Favored