Valence Bond Theory MCQs

31. The bonding in acetylene (C₂H₂) involves:

• A) sp³ hybridization
• B) sp² hybridization
• C) sp hybridization
• D) None of the above
• Answer: C

32. Which of the following is a characteristic of sigma bonds?

• A) They form through side-by-side overlap
• B) They have free rotation about the bond axis
• C) They are weaker than pi bonds
• D) They restrict molecular rotation
• Answer: B

33. The overlap of which orbitals leads to the formation of a sigma bond between two carbon atoms in ethane (C₂H₆)?

• A) sp² – sp²
• B) sp³ – sp³
• C) sp – sp
• D) p – p
• Answer: B

34. Which of the following best describes the bonding in NH₃?

• A) sp hybridization
• B) sp² hybridization
• C) sp³ hybridization
• D) No hybridization
• Answer: C

35. Valence Bond Theory cannot explain:

• A) The strength of covalent bonds
• B) Delocalization of electrons in aromatic compounds
• C) The concept of hybridization
• D) The formation of sigma bonds
• Answer: B

36. In VBT, the bond formed between two atoms with overlapping atomic orbitals is:

• A) Ionic bond
• B) Covalent bond
• C) Metallic bond
• D) Hydrogen bond
• Answer: B

37. The hybridization of phosphorus in PCl₅ is:

• A) sp
• B) sp²
• C) sp³
• D) sp³d
• Answer: D

38. Valence Bond Theory is not able to explain:

• A) Hybridization
• B) Molecular geometry
• C) Magnetic properties
• D) Bond energies
• Answer: C

39. Which bond type has an electron cloud above and below the bonding axis?

• A) Sigma bond
• B) Pi bond
• C) Hydrogen bond
• D) Ionic bond
• Answer: B

40. In Valence Bond Theory, overlapping orbitals must be:

• A) Unpaired electrons in atomic orbitals
• B) Paired electrons in molecular orbitals
• C) Atomic orbitals of opposite spin electrons
• D) None of the above
• Answer: A