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Chemical Bonding MCQs for MDCAT Practice

Chemistry section, Chemical Bonding chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 1,225 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    In the following molecules, which one has the shortest C-C bond length?
    • C3H8
    • C2H8
    • C2H4
    • C2H2 (correct answer)
    Correct answer: D
    Bond length decreases as bond order increases; triple bonds are shortest, single bonds are longest. C2H2 has a triple bond.
  2. Question 2
    Which of the following compounds shows shortest C-H bond length?
    • Methane
    • Acetylene (correct answer)
    • Ethylene
    • Ethane
    Correct answer: B
    Bond length is inversely related to bond order and directly related to the s-character of the hybrid orbitals involved. Acetylene's C-H bond is shortest due to sp hybridization.
  3. Question 3
    A bond is said to be ionic when the electronegativity difference between the bonded atoms is
    • equal to 1.0
    • equal to zero
    • less than 0.7
    • greater than 0.7 (correct answer)
    Correct answer: D
    Ionic bonds form when the electronegativity difference between atoms is large (>0.7), leading to electron transfer and charged ions.
  4. Question 4
    Which one of the following molecules has zero dipole moment.
    • NH3
    • NF3
    • BF3 (correct answer)
    • H2O
    Correct answer: C
    Molecular geometry dictates dipole moment. BF3's trigonal planar symmetry cancels bond dipoles, resulting in zero net dipole moment.
  5. Question 5
    For sp3d2 hybridization, the expected geometry will be?
    • Tetrahedral
    • Square planar
    • Trigonal
    • Octahedral (correct answer)
    Correct answer: D
    sp3d2 hybridization leads to an octahedral geometry, where electron domains are arranged symmetrically around a central atom to minimize repulsion.
  6. Question 6
    What is the hybridization of the carbon atoms in a molecule of ethyne, represented by H-C≡C-H?
    • sp2
    • sp3
    • dsp2
    • sp (correct answer)
    Correct answer: D
    Ethyne's carbon atoms, linked by a triple bond, exhibit sp hybridization due to the formation of one sigma and two pi bonds.
  7. Question 7
    The Tetra-valency of carbon is best explained by the concept of:
    • Resonance
    • Hybridization (correct answer)
    • Electron delocalization
    • VSEPR rule
    Correct answer: B
    Carbon's tetra-valency and its ability to form four bonds are best explained by hybridization, which involves mixing atomic orbitals.
  8. Question 8
    Which one of the following molecules has the shortest distance of carbon atoms?
    • CH3 - CH3
    • CH2 = CH2
    • CH ≡ CH (correct answer)
    • CH3 - CH2 - CH3
    • CH_2_ = CH_2 - CH_3_
    Correct answer: C
    Triple bonds are shorter than double or single bonds due to increased electron density and stronger overlap between atomic orbitals.

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Read the full Chemical Bonding chapter notes: Chemical Bonding notes. Or browse every chapter.