Orgo 1 SN1 vs SN2 reactions flashcards
This set of flashcards covers the differences and characteristics of SN1 and SN2 reactions in organic chemistry, providing a quick reference for students studying these fundamental mechanisms.
Quiz(24 questions)
1. Which reaction mechanism involves a carbocation intermediate?
Terms in this Study Set(24)
Mechanisms Overview(12)
What is an SN1 reaction?
A substitution reaction that involves a two-step mechanism: formation of a carbocation followed by nucleophilic attack.
What is an SN2 reaction?
A substitution reaction that occurs in a single step with a concerted mechanism involving direct nucleophilic attack.
True or False: SN1 reactions prefer strong nucleophiles.
False - SN1 reactions are more tolerant of weak nucleophiles due to the stability of the carbocation.
Compare the rate of SN1 and SN2 reactions.
SN1: rate depends on substrate stability. SN2: rate depends on both nucleophile and substrate reactivity.
Fill in the blank: SN1 reactions typically occur with ____ substrates.
tertiary or stabilized substrates due to carbocation stability.
What is the nucleophile's role in SN2?
The nucleophile attacks the substrate, displacing the leaving group in a single concerted step.
SN1 reactions lead to ____ product mixtures.
racemic mixtures due to the planar nature of carbocation.
Mechanism of SN2: Primary carbon reacts with a nucleophile to form a ____.
transition state where the bond formation and breaking occur simultaneously.
True or False: SN2 reactions are stereospecific.
True - SN2 reactions lead to inversion of configuration at the stereocenter.
What is a key characteristic of SN1 reaction kinetics?
First-order kinetics: rate depends only on the concentration of the substrate.
What influences the mechanism: SN1 or SN2?
Substrate structure, nucleophile strength, and solvent type influence the mechanism.
Cause → Effect: Carbocation stability affects ____ in SN1.
the reaction rate; more stable carbocations lead to faster reactions.
Reactivity and Conditions(12)
What type of substrate favors SN1 reactions?
Tertiary substrates favor SN1 due to stable carbocation formation.
True or False: SN2 reactions occur in polar protic solvents.
False. SN2 reactions favor polar aprotic solvents for better nucleophile activity.
Fill in the blank: A strong nucleophile is crucial for __________.
SN2 reactions, as it directly attacks the substrate.
Compare SN1 and SN2 nucleophile strength.
SN1: weak nucleophile sufficient. SN2: strong nucleophile needed.
How does nucleophile concentration affect SN2 rate?
Higher nucleophile concentration increases the rate of SN2 reactions.
What is the role of solvent in SN1 reactions?
Polar protic solvents stabilize the carbocation and solvate the leaving group.
Cause → Effect: Tertiary substrate in SN1 reaction.
Cause: Carbocation stability. Effect: Faster reaction rate.
What type of leaving group is best for SN2?
Good leaving groups like iodide or tosylate enhance SN2 reaction rates.
True or False: SN1 reactions have stereochemistry retention.
False. SN1 reactions lead to racemization due to planar carbocation.
Describe the energy barrier for SN2 reactions.
SN2 has a single transition state with a higher energy barrier compared to SN1.
How does sterics affect SN2 reactions?
Bulky groups hinder the nucleophile's approach, slowing down SN2 reactions.
What kind of kinetics do SN1 reactions exhibit?
SN1 reactions exhibit first-order kinetics, depending only on substrate concentration.
Questions in this Study Set(24)
1. Which reaction mechanism involves a carbocation intermediate?
2. Which type of substrate is most likely to undergo an SN1 reaction?
3. What type of nucleophile is generally preferred in SN2 reactions?
4. True or False: SN2 reactions are favored by polar protic solvents.
5. In which situation would an SN2 reaction likely occur?
6. Fill in the blank: A weak nucleophile is often sufficient for __________.
7. Which statement is TRUE about the stereochemistry of SN1 reactions?
8. Which statement correctly compares nucleophile strength in SN1 and SN2?
9. Which mechanism does NOT involve a concerted reaction?
10. What happens to the rate of an SN2 reaction if nucleophile concentration increases?
11. How does substrate stability influence SN1 and SN2 reactions?
12. What is the effect of polar protic solvents on SN1 reactions?
13. Which type of reaction has a rate that depends on both the substrate and nucleophile concentration?
14. Cause → Effect: A tertiary substrate in an SN1 reaction leads to which outcome?
15. In SN1 mechanisms, increasing the solvent polarity will usually result in:
16. Which of the following is NOT a good leaving group for SN2 reactions?
17. Which of the following compounds would most likely undergo an SN2 reaction?
18. True or False: SN1 reactions result in stereochemical retention.
19. What is a distinguishing feature of SN2 reactions compared to SN1?
20. How is the energy barrier for SN2 reactions characterized?
21. What happens to the stereochemistry at the nucleophilic center in an SN2 reaction?
22. What is the impact of steric hindrance on SN2 reactions?
23. Which of the following statements is false regarding SN1 reactions?
24. What kind of kinetics do SN1 reactions exhibit?
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