Organic Substitution and Elimination
Reactions: SN1, SN2, E1, E2 Key
Concepts Exam 2026 QUESTIONS AND
ANSWERS GRADED A+
SN1 reaction - Correct answer-Substitution reaction where the leaving group
leaves first to form a carbocation intermediate, then the nucleophile attacks. Occurs
in two steps.
SN2 reaction - Correct answer-Substitution reaction where the nucleophile attacks
the carbon at the same time the leaving group leaves. Occurs in one step with
backside attack, causing inversion of stereochemistry.
E1 reaction - Correct answer-Elimination reaction where the leaving group leaves
first to form a carbocation, then a base removes a β-hydrogen, forming a double
bond.
E2 reaction - Correct answer-Elimination reaction where a strong base removes a
β-hydrogen while the leaving group leaves simultaneously, forming a double bond
in one step.
©COPYRIGHT 2026, ALL RIGHTS RESERVED 1
Reactions: SN1, SN2, E1, E2 Key
Concepts Exam 2026 QUESTIONS AND
ANSWERS GRADED A+
SN1 reaction - Correct answer-Substitution reaction where the leaving group
leaves first to form a carbocation intermediate, then the nucleophile attacks. Occurs
in two steps.
SN2 reaction - Correct answer-Substitution reaction where the nucleophile attacks
the carbon at the same time the leaving group leaves. Occurs in one step with
backside attack, causing inversion of stereochemistry.
E1 reaction - Correct answer-Elimination reaction where the leaving group leaves
first to form a carbocation, then a base removes a β-hydrogen, forming a double
bond.
E2 reaction - Correct answer-Elimination reaction where a strong base removes a
β-hydrogen while the leaving group leaves simultaneously, forming a double bond
in one step.
©COPYRIGHT 2026, ALL RIGHTS RESERVED 1
