Unit 4: Structure of Molecules

What is the geometry of a molecule with two bonds and three lone pairs around the central atom?

  • A) Linear
  • B) Trigonal pyramidal
  • C) Tetrahedral
  • D) Trigonal bipyramidal

Answer: A) Linear

Which molecule has a trigonal bipyramidal shape and three lone pairs on the central atom?

  • A) Sulfur hexafluoride (SF₆)
  • B) Phosphorus trifluoride (PF₃)
  • C) Phosphorus pentachloride (PCl₅)
  • D) Chlorine trifluoride (ClF₃)

Answer: D) Chlorine trifluoride (ClF₃)

What is the bond angle in a molecule with a bent shape and two lone pairs on the central atom?

  • A) 90°
  • B) 120°
  • C) 109.5°
  • D) 104.5°

Answer: D) 104.5°

Which molecule has a central atom with sp² hybridization and a trigonal planar geometry?

  • A) Boron trifluoride (BF₃)
  • B) Methane (CH₄)
  • C) Ethylene (C₂H₄)
  • D) Ammonia (NH₃)

Answer: C) Ethylene (C₂H₄)

Which molecule has a central atom with sp³d hybridization and a seesaw shape?

  • A) Methane (CH₄)
  • B) Phosphorus pentachloride (PCl₅)
  • C) Sulfur hexafluoride (SF₆)
  • D) Chlorine trifluoride (ClF₃)

Answer: B) Phosphorus pentachloride (PCl₅)

What is the bond angle in a molecule with a square planar shape?

  • A) 90°
  • B) 120°
  • C) 109.5°
  • D) 180°

Answer: A) 90°

Which molecule has a central atom with sp³d² hybridization and a square pyramidal shape?

  • A) Methane (CH₄)
  • B) Phosphorus pentachloride (PCl₅)
  • C) Sulfur hexafluoride (SF₆)
  • D) Chlorine trifluoride (ClF₃)

Answer: C) Sulfur hexafluoride (SF₆)

Which molecule has a central atom with sp² hybridization and a linear shape?

  • A) Methane (CH₄)
  • B) Carbon dioxide (CO₂)
  • C) Ethylene (C₂H₄)
  • D) Water (H₂O)

Answer: B) Carbon dioxide (CO₂)

What is the geometry of a molecule with three bonding pairs and one lone pair around the central atom?

  • A) Trigonal planar
  • B) Trigonal pyramidal
  • C) Tetrahedral
  • D) Linear

Answer: B) Trigonal pyramidal

Which of the following molecules has a central atom with sp hybridization and a bond angle of 180°?

  • A) Methane (CH₄)
  • B) Acetylene (C₂H₂)
  • C) Boron trifluoride (BF₃)
  • D) Water (H₂O)

Answer: B) Acetylene (C₂H₂)

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