Electronic effects inductive electromeric resonance and hyperconjugation - One Line Questions

1. Which group will exhibit a negative inductive effect (-I)? — -Br
2. Which of the following has the strongest -I effect? — -F
3. Which group will exhibit a positive inductive effect (+I)? — -CH3
4. Which of the following groups shows a -M effect? — -NO2
5. Which symbol is used to represent the electromeric effect? — →
6. Which of the following is a correct resonance structure of benzene? — A structure with delocalized pi electrons represented by a circle.
7. Which of the following is a correct resonance contributor for the carboxylate ion (-COO-)? — A structure where the negative charge and double bond are delocalized between the two oxygen atoms.
8. Resonance structures are: — Hypothetical structures contributing to the overall stability
9. Hyperconjugation is most significant in: — Carbocations and alkenes with alpha-hydrogens
10. In resonance, the actual structure of the molecule is a: — Average of all contributing structures
11. The delocalization of electrons in resonance leads to: — Charge dispersal
12. The +I effect of alkyl groups follows the order: — CH3- < CH3CH2- < (CH3)2CH- < (CH3)3C-
13. In which of the following is the electromeric effect most likely to occur? — CH3-C≡C-CH3
14. In electrophilic aromatic substitution, the activating groups are those that: — Activate the ring by donating electron density.
15. Resonance leads to: — Increased stability
16. The stability of alkenes increases with: — Increasing number of alpha-hydrogens
17. Hyperconjugation is also known as: — No-bond resonance
18. Which of the following is a permanent effect in organic chemistry? — Inductive effect
19. The electromeric effect is a phenomenon of: — Temporary displacement of pi electrons
20. The +M effect is associated with: — Groups with lone pairs or pi electrons that can be donated
21. Which of the following shows the correct order of -I strength? — F > Cl > Br > I
22. The strength of the inductive effect decreases with: — Increase in distance from the functional group
23. The -I effect of a group generally leads to: — Decreased electron density at the point of attachment.
24. The stability order of carbanions is generally the reverse of carbocations due to: — Inductive effect
25. Which effect is responsible for the increased stability of the allyl carbocation? — Resonance
26. Which effect is responsible for the stability of the tert-butyl carbocation? — Hyperconjugation
27. The greater the number of alpha-hydrogens, the greater is the: — Hyperconjugation stabilization
28. Which of the following is NOT a type of electronic effect? — Steric effect
29. Which effect stabilizes alkyl radicals? — Hyperconjugation
30. Which effect is responsible for the difference in reactivity between ethene and ethane towards electrophiles? — Electromeric effect
31. Which of the following is a temporary effect, occurring only in the presence of an attacking reagent? — Electromeric effect
32. The order of basicity of amines (e.g., NH3, RNH2, R2NH, R3N) is influenced by: — Inductive effect and solvation
33. Consider the acidity of phenol and ethanol. Phenol is more acidic due to: — Resonance stabilization of the phenoxide ion.
34. The presence of a double bond in a molecule allows for: — Electromeric effect and resonance
35. Which of the following statements about hyperconjugation is FALSE? — It requires the presence of an unsaturated system.
36. Which of the following is a characteristic of resonance energy? — It is the difference in energy between the actual molecule and the most stable hypothetical resonance structure.
37. Which of the following molecules exhibits resonance? — Benzene (C6H6)
38. Which of the following is the most stable carbocation based on hyperconjugation? — Tertiary carbocation (R3C+)
39. The electromeric effect is observed in molecules containing: — Multiple bonds (double or triple bonds)
40. The relative stability of species like carbocations, carbanions, and radicals is primarily determined by: — Inductive effect, resonance, and hyperconjugation
41. The inductive effect involves the displacement of which type of electrons? — Sigma (σ) electrons
42. Hyperconjugation involves the overlap of: — Sigma (σ) orbitals of C-H or C-C bonds with adjacent empty p-orbitals or π-orbitals
43. The inductive effect is transmitted through: — Sigma bonds
44. Consider the acidity of formic acid, acetic acid, and propanoic acid. The acidity decreases in the order: — Formic acid > Acetic acid > Propanoic acid
45. The electromeric effect involves the displacement of: — Pi (π) electrons
46. The resonance effect is associated with the delocalization of: — Pi (π) electrons and lone pairs
47. The +I effect of an alkyl group is generally: — Strong
48. The inductive effect is considered a/an ______ effect. — Permanent
49. In the electromeric effect, the displacement of pi electrons occurs towards: — The more electronegative atom
50. The +M effect of -OH group in phenol activates the ortho and para positions due to: — Donation of electron density into the ring via resonance.
All One Line Questions
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