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Chemical Bonding and Molecular Structure NEET MCQ & Practice Questions

Practice Chemical Bonding and Molecular Structure MCQs for NEET Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Chemical Bonding and Molecular Structure Revision Guide for NEET Chemistry

Chemical Bonding and Molecular Structure explains why atoms combine and how bonding controls molecular shape, polarity and properties. It is a high-connectivity chapter because its ideas reappear throughout inorganic and organic chemistry.

For NEET Chemistry, combine Lewis structures with VSEPR, hybridisation, valence bond ideas and molecular orbital theory. Practise predicting geometry and magnetic behaviour rather than memorising examples without reasoning.

Important Topics

  • Lewis structures and formal charge
  • VSEPR theory and molecular geometry
  • Hybridisation
  • Bond parameters and polarity
  • Hydrogen bonding
  • Molecular orbital theory

Important Formulae & Relationships

  • Formal charge = valence e− − nonbonding e− − 1/2(bonding e−)
  • Bond order (MOT) = 1/2(Nb − Na)
  • Dipole moment μ = q × r

Use formulas only after checking the required units, sign convention and assumptions for the question.

What to practise in Chemical Bonding and Molecular Structure

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Chemical Bonding and Molecular Structure before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for NEET Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 19 Chemical Bonding and Molecular Structure MCQs with Answers

These public questions are selected from the exact Chemical Bonding and Molecular Structure chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

1. The hybridisation of carbon atoms in ethyne is

  • A. sp2
  • B. sp3
  • C. dsp2
  • D. sp
Answer: D
Explanation: Each carbon in ethyne forms two sigma bonds and two pi bonds, corresponding to sp hybridisation.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

2. Which species has the highest bond order according to molecular orbital theory?

  • A. O2²−
  • B. O2+
  • C. O2
  • D. O2−
Answer: B
Explanation: Removing one electron from an antibonding π* orbital of O2 increases bond order from 2 to 2.5. Therefore O2+ has the highest bond order.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

3. Which statement correctly compares sigma and pi bonds?

  • A. A sigma bond permits freer rotation than a pi bond
  • B. A pi bond is formed by head-on overlap
  • C. A sigma bond can exist only with a pi bond
  • D. A pi bond is stronger than a sigma bond formed by the same orbitals
Answer: A
Explanation: Sigma bonds arise from head-on overlap and generally allow rotation, whereas pi bonds restrict rotation.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

4. How many sigma and pi bonds are present in ethene?

  • A. 5 sigma and 2 pi
  • B. 5 sigma and 1 pi
  • C. 4 sigma and 2 pi
  • D. 6 sigma and 1 pi
Answer: B
Explanation: Ethene has four C–H sigma bonds, one C–C sigma bond and one C=C pi bond.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

5. Which species is diamagnetic?

  • A. O2+
  • B. O2−
  • C. O2²−
  • D. O2
Answer: C
Explanation: O2²− has all electrons paired in its molecular orbitals and is diamagnetic.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

6. The correct order of bond length is

  • A. O2− < O2 < O2+ < O2²−
  • B. O2+ < O2 < O2− < O2²−
  • C. O2²− < O2− < O2 < O2+
  • D. O2 < O2+ < O2− < O2²−
Answer: B
Explanation: Bond length decreases as bond order increases. Bond orders are 2.5, 2, 1.5 and 1 respectively.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

7. Which molecule has zero dipole moment despite having polar bonds?

  • A. H2O
  • B. BF3
  • C. SO2
  • D. NH3
Answer: B
Explanation: BF3 is trigonal planar and symmetrical, so the three B–F bond dipoles cancel.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

8. Which species has sp3d2 hybridisation at the central atom?

  • A. IF7
  • B. SF6
  • C. PCl5
  • D. XeF4
Answer: B
Explanation: SF6 has six bond pairs and octahedral geometry, corresponding to sp3d2 hybridisation.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

9. The shape of XeF4 is

  • A. Square planar
  • B. Seesaw
  • C. Trigonal bipyramidal
  • D. Tetrahedral
Answer: A
Explanation: XeF4 has six electron pairs around Xe: four bond pairs and two opposite lone pairs. Its molecular shape is square planar.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

10. Which molecule has the smallest bond angle?

  • A. BF3
  • B. CH4
  • C. NH3
  • D. H2O
Answer: D
Explanation: Lone-pair repulsion compresses bond angles: CH4 109.5°, NH3 about 107°, H2O about 104.5°, BF3 120°.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

11. Which compound has maximum covalent character?

  • A. KCl
  • B. NaCl
  • C. MgCl2
  • D. AlCl3
Answer: D
Explanation: Al3+ has the highest charge density and polarising power, so AlCl3 has the greatest covalent character by Fajan's rule.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

12. Which molecule contains a coordinate covalent bond?

  • A. CH4
  • B. Cl2
  • C. H2
  • D. NH4+
Answer: D
Explanation: NH4+ forms when NH3 donates its lone pair to H+, creating a coordinate bond.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

13. Which hydrogen halide has the highest boiling point?

  • A. HI
  • B. HF
  • C. HCl
  • D. HBr
Answer: B
Explanation: HF forms strong intermolecular hydrogen bonds, giving it the highest boiling point.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

14. Which molecule exhibits intramolecular hydrogen bonding?

  • A. p-Nitrophenol
  • B. Ethanol
  • C. Water
  • D. o-Nitrophenol
Answer: D
Explanation: In o-nitrophenol, the hydroxyl hydrogen bonds to a nearby nitro oxygen within the same molecule.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

15. Which order of repulsion is correct according to VSEPR theory?

  • A. BP–LP > BP–BP > LP–LP
  • B. LP–LP > LP–BP > BP–BP
  • C. BP–BP > LP–BP > LP–LP
  • D. LP–BP > LP–LP > BP–BP
Answer: B
Explanation: Lone pairs occupy more space than bond pairs, so repulsion follows LP–LP > LP–BP > BP–BP.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

16. The formal charge on nitrogen in NH4+ is

  • A. 0
  • B. −1
  • C. +2
  • D. +1
Answer: D
Explanation: Formal charge = valence electrons − nonbonding electrons − half of bonding electrons = 5 − 0 − 4 = +1.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

17. Which resonance structure contributes most to the resonance hybrid?

  • A. All structures always contribute equally
  • B. The one with maximum charge separation
  • C. The one with complete octets and minimum formal charges
  • D. The one placing negative charge on the less electronegative atom
Answer: C
Explanation: The most stable canonical form has complete octets, minimum charge separation, and negative charge on the more electronegative atom.

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

18. Which molecule has the greatest percentage s-character in the hybrid orbitals of the central atom?

  • A. C2H4
  • B. C2H2
  • C. NH3
  • D. CH4
Answer: B
Explanation: sp hybrid orbitals have 50% s-character, greater than sp2 (33.3%) and sp3 (25%).

NEET Chemistry · Chemical Bonding and Molecular Structure · Very Hard

19. Consider the statements

  • A. I, II, III and IV
  • B. I, II and IV only
  • C. I and III only
  • D. II and III only
Answer: B
Explanation: I, II and IV are correct. Symmetrical molecules such as BF3 can contain polar bonds but have zero net dipole moment.

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Chemical Bonding and Molecular Structure Practice Tests

Chemical Bonding and Molecular Structure Frequently Asked Questions

What should I master first in Chemical Bonding?

Start with Lewis structures, electron-pair counting and VSEPR. These make geometry and hybridisation questions much easier.

Why is molecular orbital theory important?

It explains bond order and magnetic behaviour, including cases that simple Lewis structures cannot describe adequately.

How can I avoid geometry mistakes?

Count electron domains around the central atom, distinguish electron-pair geometry from molecular shape, and then account for lone-pair repulsions.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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