Valence bond theory resonance and molecular orbital theory basics - One Line Questions

1. The bond order in MOT is calculated as: — (Number of bonding electrons - Number of antibonding electrons) / 2
2. The bond order of He2 molecule, according to MOT, is: — 0
3. The bond order of Li2 molecule, according to MOT, is: — 1
4. In the resonance structures of carbonate ion (CO3^2-), how many resonance structures are possible? — 3
5. The number of sigma bonds in a single bond is: — 1
6. According to MOT, the bond order of O2- is: — 1.5
7. According to MOT, the bond order of O2+ is: — 2.5
8. Which of the following pairs of atomic orbitals can form a pi (π) bond through lateral overlap? — 2pz and 2pz
9. The number of pi electrons in benzene (C6H6) is: — 6
10. Antibonding molecular orbitals are formed by the destructive interference of atomic orbitals and possess: — A node between the nuclei.
11. Which of the following is an example of a resonance hybrid? — An intermediate structure that averages properties of contributing structures.
12. A bond order of zero in MOT indicates: — The molecule does not exist.
13. The energy difference between the resonance hybrid and the most stable contributing resonance structure is called: — Resonance energy
14. Benzene (C6H6) is a classic example of a molecule exhibiting resonance. Its resonance structures show: — Equal bond lengths between all carbon atoms.
15. The actual structure of a molecule exhibiting resonance is: — An average of the contributing resonance structures.
16. Which of the following molecule has sp3 hybridization? — C2H6 (Ethane)
17. Molecular Orbital Theory (MOT) differs from VBT and Lewis theory by: — Describing molecular orbitals formed from the combination of all atomic orbitals of the constituent atoms.
18. According to MOT, the oxygen molecule (O2) is: — Paramagnetic with a bond order of 2.
19. According to MOT, the molecule B2 is: — Paramagnetic with bond order 1
20. In VBT, the overlap of atomic orbitals is responsible for: — Bond formation
21. The formation of a pi (π) bond involves: — Lateral overlap of atomic orbitals.
22. Which of the following species exhibits resonance? — O3 (Ozone)
23. Which atomic orbitals overlap to form a sigma (σ) bond between two p-orbitals? — End-to-end overlap
24. Bonding molecular orbitals are formed by the constructive interference of atomic orbitals and have: — Lower energy than the parent atomic orbitals.
25. In the context of resonance, the delocalization of electrons leads to: — Increased stability.
26. Which of the following is a key limitation of Valence Bond Theory? — It does not adequately explain the magnetic properties of some molecules, like O2.
27. The stability of a molecule exhibiting resonance is generally: — Higher than any of its contributing resonance structures.
28. Which of the following diatomic molecules is paramagnetic according to MOT? — O2
29. A double bond consists of: — One sigma bond and one pi bond.
30. A triple bond consists of: — One sigma bond and two pi bonds.
31. In MOT, when atomic orbitals combine, they form: — Both bonding and antibonding molecular orbitals.
32. In Valence Bond Theory, a covalent bond is formed when atomic orbitals overlap. — Half-filled atomic orbitals overlap to form a sigma or pi bond.
33. In resonance, the contributing structures are: — Hypothetical structures that cannot be isolated.
34. Which of the following molecular orbitals is formed by the end-to-end overlap of atomic orbitals? — Sigma (σ) molecular orbital
35. Which of the following molecular orbitals is formed by the lateral overlap of atomic orbitals? — Pi (π) molecular orbital
36. What is the primary difference between sigma (σ) and pi (π) bonds in VBT? — Sigma bonds involve end-to-end overlap of orbitals and are stronger than pi bonds, which involve side-by-side overlap.
37. Which type of hybridization is associated with a trigonal planar geometry? — sp2
38. The hybridization of the central atom in methane (CH4) is: — sp3
39. Which hybridization scheme leads to linear geometry? — sp
40. In the molecule H2O, the oxygen atom is hybridized as: — sp3
41. According to VBT, the molecule BCl3 has: — sp2 hybridization and trigonal planar geometry.
42. Resonance is a concept used to describe: — The averaging of bond lengths and electron distribution in certain molecules or ions.
43. Hybridization in Valence Bond Theory is a concept used to explain: — The geometry and equivalent bonding of molecules.
44. The concept of hybridization in VBT helps explain: — The bond angles and shapes of molecules.
45. Which of the following is a characteristic of resonance structures? — They differ only in the distribution of electrons.
46. Which theory best explains the paramagnetism of oxygen (O2)? — Molecular Orbital Theory
47. Which of the following statements is NOT true regarding Valence Bond Theory (VBT)? — VBT effectively explains the magnetic properties of molecules like O2.
48. Which of the following is an antibonding molecular orbital? — σ*
49. Which of the following is a bonding molecular orbital? — σ
50. In the molecular orbital diagram of N2, the order of filling molecular orbitals is: — σ1s, σ*1s, σ2s, σ*2s, σ2pz, π2px, π2py, π*2px, π*2py, σ*2pz
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