MCQs on Molecular Orbital Theory

MCQs on Molecular Orbital Theory

1. Which among the following has the shortest C-C bond length?

(a) Ethene

(b) Ethane

(c) Benzene

(d) Ethyne

2. The oxygen molecule is paramagnetic. It can be explained by

(a) Resonance

(b) Hybridisation

(c) Valence bond theory

(d) Molecular orbital theory

3. Find the paramagnetic species

(a) CN^–

(b) NO⁺

(c) CO

(d) O₂^–

4. Find the diamagnetic species

(a) H₂

(b) H₂^–

(c) He₂⁺

(d) H₂⁺

5. Which of the following pairs has the same bond order?

(a) O₂⁺, NO⁺

(b) N₂, O₂

(c) O₂^2-, B₂

(d) NO, CO

6. Each P of P₄O₁₀ is attached to how many oxygen atoms?

(a) 3

(b) 2.5

(c) 2

(d) 4

7. When O₂ changes to O₂^–, the electron goes to which of the orbitals?

(a) ???? orbital

(b) ???? orbital

(c) ????^* orbital

(d) ????^* orbital

8. O-O bond length is minimum in

(a) O₂^–

(b) O₂

(c) O₂⁺

(d) O₂^2-

9. Which of the following is not paramagnetic?

(a) CO

(b) N₂⁺

(c) NO

(d) O₂^–

10. Find the molecule having the highest bond order

(a) O₂⁺

(b) O₂^–

(c) O₂^2-

(d) O₂

Answer

1. (d)	2. (d)	3. (d)	4. (a)	5. (c)
6. (d)	7. (c)	8. (c)	9. (a)	10. (a)