Organic Reaction Mechanisms - One Line Questions

1. In electrophilic addition to conjugated dienes, which product is favored under kinetic control? — 1,2-addition product
2. What is the product of the reaction between a Grignard reagent and an aldehyde? — A secondary alcohol
3. The addition of a halogen to an alkene typically proceeds via: — A bromonium ion intermediate
4. In electrophilic aromatic substitution, what is the electrophile typically derived from? — A species that can accept an electron pair
5. What is the name of the species formed when a proton is removed from a carbon atom adjacent to a double bond? — Allylic carbocation
6. Which of the following is a common electrophile in organic chemistry? — Boron trifluoride (BF3)
7. The rate-determining step in an SN1 reaction is the: — Loss of the leaving group
8. Which species acts as a Lewis base in the reaction of BF3 with NH3? — NH3
9. What is the intermediate formed in an SN1 reaction? — Carbocation
10. Which species is characterized by having an unpaired electron? — Free Radical
11. What is the typical intermediate in a free radical chain reaction? — Free Radical
12. What is the intermediate formed in the free radical halogenation of alkanes? — Free Radical
13. What type of intermediate is formed in the reaction of an alkyne with H2O in the presence of H2SO4 and HgSO4? — Vinyl cation
14. Which of the following is a common example of an electrophile in organic chemistry? — BF3
15. What is the term for a reaction that proceeds in a sequence of elementary steps? — Stepwise reaction
16. In electrophilic aromatic substitution, activating groups: — Activate the ring and are ortho/para-directing
17. What is the term for a species that donates an electron pair to form a covalent bond? — Nucleophile
18. What is the term for a species that readily donates a pair of electrons? — Nucleophile
19. What type of reaction is the addition of Br2 to ethene? — Electrophilic Addition
20. Which mechanism describes the reaction of an alkene with a peroxy acid to form an epoxide? — Concerted Epoxidation
21. What is the primary driving force for E2 elimination reactions? — Simultaneous removal of a proton and a leaving group
22. What is the key characteristic of a concerted reaction? — Single step with simultaneous bond changes
23. Which type of reaction involves the movement of a pair of electrons from a nucleophile to an electrophile? — Nucleophilic Addition
24. Which of the following is an example of a nucleophile? — CN-
25. The regioselectivity of electrophilic addition to unsymmetrical alkenes is explained by which rule? — Markovnikov's Rule
26. What is the correct order of leaving group ability from best to worst? — I- > Br- > Cl- > F-
27. In a concerted reaction mechanism, bond breaking and bond formation occur: — Simultaneously
28. Which of the following is NOT a characteristic of SN2 reactions? — Formation of a carbocation intermediate
29. Which statement accurately describes a nucleophile? — It is electron-rich and donates electrons.
30. Which of the following is an example of a Lewis acid? — BF3
31. What is the correct term for a molecule or ion that can accept an electron pair? — Electrophile
32. Which reaction involves the addition of HX to an alkene, where X is a halogen? — Electrophilic Addition
33. Which mechanism involves the formation of a sigma complex (arenium ion)? — Electrophilic Aromatic Substitution
34. The intermediate formed in the addition of HBr to propene without peroxide is a: — Secondary carbocation
35. The concerted, one-step mechanism is characteristic of which type of reaction? — SN2
36. Which type of mechanism is characteristic of the reaction of an alkene with H2O in the presence of an acid catalyst? — Electrophilic Addition
37. The reaction of an alkyl halide with a strong base to form an alkene proceeds via which mechanism? — E2
38. Which type of reaction mechanism is typically involved when a strong nucleophile attacks a carbonyl carbon? — Nucleophilic Addition
39. The rearrangement of carbocations is a common feature of which reaction type? — SN1
40. Which reaction mechanism involves a two-step process with an intermediate carbocation? — SN1
41. Which reaction mechanism is favored by polar protic solvents in alkyl halide reactions? — SN1
42. In an SN2 reaction, aprotic solvents generally: — Speed up the reaction by stabilizing the nucleophile
43. What is the term for a reaction where bonds are broken and formed in a single step? — Concerted reaction
44. What is the term for a reaction that involves cyclic movement of electrons? — Pericyclic reaction
45. In SN2 reactions, what is the order of reactivity of primary, secondary, and tertiary alkyl halides? — Primary > Secondary > Tertiary
46. The stability of carbocations follows the order: — Tertiary > Secondary > Primary
47. The stability of carbanions generally follows the order: — Methyl > Primary > Secondary > Tertiary
48. The Zaitsev's rule predicts the formation of: — The more substituted alkene
49. What is the role of a leaving group in nucleophilic substitution reactions? — To depart from the carbon atom with its bonding electrons
50. What is the role of a catalyst in an organic reaction? — To provide an alternative reaction pathway with lower activation energy
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