JEE Main Chemical Bonding & Molecular Structure Questions 2027: PYQs, Important Topics & Weightage
Joint Entrance Exam (JEE) Main 2027 ( JEE Main )
JEE Main 2027 Exam Date Session 1
22 Jan '27 - 24 Jan '27
In JEE Mains Chemistry, chemical bonding and molecular structure is one of the most important chapters. 2 to 3 questions are asked from this chapter every year in each shift of JEE Main. Molecular Orbital Theory (MOT), Hybridisation & VSEPR Theory, Dipole Moment & Polarity, and Fajan’s Rules & Hydrogen Bonding are some of the most asked concepts from this chapter.
JEE Mains 2027 Chemical Bonding & Molecular Structure Questions
JEE Main Chemical Bonding & Molecular Structure Questions 2027: In the Chemistry section of JEE Mains, Chemical Bonding & Molecular Structure remains the single highest-yield chapter from Inorganic/Physical Chemistry. This chapter consistently accounted for 8% to 10% of the total Chemistry section across all exam shifts in the last 5 years. In each shift, approximately 2 to 3 questions come from the chemical bonding chapter. On this page, candidates can get JEE Main Chemical Bonding & Molecular Structure PYQs and practice papers. We also provided a detailed analysis of chemical bonding chapter weightage and high priority concepts/subtopics to prepare for the JEE Main 2027.
- Key Highlights for JEE Main Chemical Bonding & Molecular Structure
- JEE Mains 2027 Chemical Bonding and Molecular Structure Questions
- JEE Main Chemical Bonding & Molecular Structure Weightage: 5-Year Trend Analysis (2021 to 2026)
- JEE Mains Chemical Bonding & Molecular Structure Concept-Wise Weightage (2021 to 2026)
- Preparation Strategy for Chemical Bonding & Molecular Structure for JEE Main 2027
- High Probability JEE Main 2027 Chemical Bonding and Molecular Structure Questions
Key Highlights for JEE Main Chemical Bonding & Molecular Structure
After the analysis of the past 5 year JEE Main question papers, Shiksha experts have the following observations for the chemical bonding and molecular structure questions:
- Consistent appearance each year: 2 to 3 direct questions per shift.
- Most repeated concept:
- Molecular Orbital Theory (MOT): Electronic configuration of N2 vs. O2 systems, mixing of s-p orbitals, fractional bond orders, and identifying diamagnetic vs. paramagnetic species.
- Hybridisation & VSEPR Theory: Determining lone pair-bond pair distribution and exact geometry for interhalogens, noble gas compounds, and polyatomic anions (e.g., XeF4, XeO3, SF4, I3-, ClF3).
- Dipole Moment & Polarity: Comparing planar vs. non-planar polarities (NF3 vs. NH3, BF3, SO2).
- Fajan’s Rules & Hydrogen Bonding: Covalent vs. ionic character trends, lattice energy comparisons, and boiling point/solubility anomalies due to intra vs. intermolecular H-bonding (o-nitrophenol vs. p-nitrophenol).
- Type of questions asked: Over 85% are single-choice MCQs and approximately 15% appear as integer/numerical value questions in JEE Mains exam.
Also Check:
| JEE Main Vector & 3D Questions 2027 | JEE Main 2027 Matrices & Determinants Questions |
JEE Mains 2027 Chemical Bonding and Molecular Structure Questions
From below, candidates can download the JEE Main questions for the Chemical Bonding and Molecular Structure chapters. These questions have been curated from the past 5 year JEE Mains question papers.
Question 1
Heat treatment of muscular pain involves radiation of a wavelength of about 900 nm. Which spectral line of the H atom is suitable for this?
Given: Rydberg constant RH = 105 cm-1, h = 6.6 × 10-34 J s, c = 3 × 108 m/s
- Lyman series, ∞ → 1
- Paschen series, 5 → 3
- Paschen series, ∞ → 3
- Balmer series, ∞ → 2
Question 2
Match LIST-I with LIST-II.
| LIST-I (Classification of molecules based on the octet rule) | LIST-II (Example) |
|---|---|
| A. Molecules obeying octet rule | I. NO, NO2 |
| B. Molecules with incomplete octet | II. BCl3, AlCl3 |
| C. Molecules with incomplete octet with odd electron | III. H2SO4, PCl5 |
| D. Molecules with expanded octet | IV. CCl4, CO2 |
Choose the correct answer from the options given below:
- A-IV, B-I, C-III, D-II
- A-II, B-IV, C-III, D-I
- A-IV, B-II, C-I, D-III
- A-III, B-II, C-I, D-IV
Question 3
Given below are two statements:
Statement (I): For a given shell, the total number of allowed orbitals is given by n2.
Statement (II): For any subshell, the spatial orientation of the orbitals is given by -l to +l values including zero.
In the light of the above statements, choose the correct answer from the options given below:
- Both Statement I and Statement II are true
- Statement I is true but Statement II is false
- Statement I is false but Statement II is true
- Both Statement I and Statement II are false
Question 4
Which of the following statement is true with respect to H2O, NH3 and CH4?
A. The central atoms of all the molecules are sp3 hybridized.
B. The H-O-H, H-N-H and H-C-H angles in the above molecules are 104.5°, 107.5° and 109.5°, respectively.
C. The increasing order of dipole moment is CH4 < NH3 < H2O.
D. Both H2O and NH3 are Lewis acids and CH4 is a Lewis base.
E. A solution of NH3 in H2O is basic. In this solution NH3 and H2O act as Lowry-Brønsted acid and base respectively.
Choose the correct answer from the options given below:
- A, B and C only
- A, B, C and E only
- C, D and E only
- A, D and E only
Question 5
Which of the following linear combinations of atomic orbitals will lead to the formation of molecular orbitals in homonuclear diatomic molecules [internuclear axis in z-direction]?
A. 2pz and 2px
B. 2s and 2px
C. 3dxy and 3dx2-y2
D. 2s and 2pz
E. 2pz and 3dx2-y2
Choose the correct answer from the options given below:
- A and B Only
- D Only
- E Only
- C and D Only
Question 6
For the hydrogen atom, the orbital/s with the lowest energy is/are:
(A) 4s
(B) 3px
(C) 3dx2-y2
(D) 3dz2
(E) 4pz
Choose the correct answer from the options given below:
- (A), (B) and (C) only
- (A) only
- (B) only
- (B), (C) and (D) only
Question 7
Given below are two statements:
Statement (I): Experimentally determined oxygen-oxygen bond lengths in O3 are found to be same and the bond length is greater than that of a O=O (double bond) but less than that of a single (O−O) bond.
Statement (II): The strong lone pair-lone pair repulsion between oxygen atoms is solely responsible for the fact that the bond length in ozone is smaller than that of a double bond (O=O) but more than that of a single bond (O−O).
In the light of the above statements, choose the correct answer from the options given below:
- Statement I is false but Statement II is true
- Both Statement I and Statement II are true
- Statement I is true but Statement II is false
- Both Statement I and Statement II are false
Question 8
Given below are two statements:
Statement I: According to Bohr's model of hydrogen atom, the angular momentum of an electron in a given stationary state is quantised.
Statement II: The concept of electron in Bohr's orbit, violates the Heisenberg uncertainty principle.
In the light of the above statements, choose the most appropriate answer from the options given below:
- Both Statement I and Statement II are correct.
- Statement I is correct but Statement II is incorrect.
- Statement I is incorrect but Statement II is correct.
- Both Statement I and Statement II are incorrect.
Question 9
Given,
(A) n = 5, ml = -1
(B) n = 3, l = 2, ml = -1, ms = +1⁄2
The maximum number of electron(s) in an atom that can have the quantum numbers as given in (A) and (B) respectively are:
- 8 and 1
- 2 and 4
- 4 and 1
- 26 and 1
Question 10
The work functions of two metals (MA and MB) are in the 1 : 2 ratio. When these metals are exposed to photons of energy 6 eV, the kinetic energy of liberated electrons of MA : MB is in the ratio of 2.642: 1. The work functions (in eV) of MA and MB are respectively:
- 1.4, 2.8
- 1.5, 3.0
- 3.1, 6.2
- 2.3, 4.6
Commonly asked questions
Chapterwise weightage of class 11 and 12 topics in JEE Main are mentioned below:
- Physics: Current Electricity Waves AC, Magnetism, Laws of Motion Work, Power and Energy.
- Chemistry the high weightage topics are s and p block elements, Coordination compounds, Thermodynamics Gaseous state, Chemical bonding, Atomic structure, Polymers, Environmental Chemistry Organic Chemistry.
- Mathematics, the high weightage topics are Sequence and Series Vectors and 3D, Integral and Differential Calculus, Definite and Indefinite Integral.
Usually, in the JEE Mains computer-based exam, questions from maths are presented first, followed by Physics and Chemistry.
But candidates can appear for any section first, as per their preference.
Students who are preparing for JEE Main exam are advised to first cover the entire JEE Main syllabus. Covering only the high weightage chapters would decrease their chances of getting full/high score in JEE Main exam. Only after covering the entire syllabus, students can check most important chapters for JEE Mains.
There are two question types in JEE Main exam. Multiple choice questions and numerical ability questions. In MCQ, every question has 4 options with only 1 correct answer. Select the correct option. In numerical ability question type, no options are there. Solve them and write answer using keyword and mouse.
JEE Main Chemical Bonding & Molecular Structure Weightage: 5-Year Trend Analysis (2021 to 2026)
From the past 5 year analysis following has been the weightage of the Chemical Bonding & Molecular Structure chapter:
| Exam Year |
Typical Questions / Shift |
Section Weightage (Approx.) |
Marks |
|---|---|---|---|
| JEE Main 2026 |
2 to 3 questions |
8.5% to 10.0% |
8 to 12 marks |
| JEE Main 2025 |
2 to 3 questions |
8.0% to 10.0% |
8 to 12 marks |
| JEE Main 2023 |
2 to 3 questions |
7.5% to 9.5% |
8 to 12 marks |
| JEE Main 2022 |
2 to 3 questions |
8.0% to 10.0% |
8 to 12 marks |
| JEE Main 2021 |
2 to 4 questions |
8.5% to 11.0% |
8 to 16 marks |
JEE Mains Chemical Bonding & Molecular Structure Concept-Wise Weightage (2021 to 2026)
It has been noted that from the chemical bonding and molecular structure chapter, numerical value type question re asked around lone pairs, bond order, or number of paramagnetic species. Check below the most asked concepts/subtopics from this chapter:
| Subtopic / Concept |
Share of Chapter Questions |
Core Recurring Question Types |
|---|---|---|
| Molecular Orbital Theory (MOT) |
35% |
Diatomic homonuclear/heteronuclear species Calculation of Bond Order and Bond Length ordering Magnetic Behaviour (diamagnetic vs. paramagnetic identification) |
| VSEPR Theory & Hybridisation |
25% |
Predicting steric number, hybridisation, and geometry vs. shape. Counting lone pair–bond pair combinations Iso-structural and isoelectronic species matching |
| Dipole Moment & Polarity |
15% |
Zero vs. non-zero dipole moment Directional vector comparisons |
| Hydrogen Bonding & Intermolecular Forces |
15% |
Intermolecular vs intramolecular H-bonding effects on boiling points, melting points, and solubility Extent and strength of H-bonds across hydrides of groups 15, 16, and 17 |
| Fajan’s Rule & Formal Charge / Resonance |
10% |
Ionic vs. Covalent character trends based on cation size, charge, and pseudo-inert gas configuration. Thermal stability and solubility of carbonates/sulfates. Formal charge calculations and equivalent Lewis structures |
Commonly asked questions
JEE Main has 75 questions (20 MCQs + 5 Numerical per subject) across Physics, Chemistry, Math. 3-hour CBT awards +4 for correct, -1 for incorrect answers, totalling 300 marks.
Students can download JEE Main previous year question paper from Shiksha page. Candidates are provided JEE Main previous year question papers from the year 2014 to 2026. The papers can be downloaded as PDF and can be practised to prepare for the exam.
JEE Main question paper is in English, Hindi and language selected when you filled application form. In total, JEE Main is in 13 languages and you can select any language out of available options. You cannot switch language of question paper during exam.
JEE Main mock tests are available online on nta.ac.in. Download these for free or you can also practice online. You can download JEE Main mock test papers for free from Shiksha page as well.
Preparation Strategy for Chemical Bonding & Molecular Structure for JEE Main 2027
Check below some tips to ace the chemical bonding and the molecular structure chapter from the JEE Main syllabus 2027:
- Master VSEPR & Hybridisation Calculations: Practice determining the steric number quickly to immediately identify molecular geometry, bond angles, and lone pair repulsions.
- Memorise Molecular Orbital Theory (MOT): Memorise the energy level diagrams. Focus on calculating bond orders, identifying bond lengths, and predicting magnetic properties (diamagnetic vs. paramagnetic).
- Learn Dipole Moment Exceptions: Go beyond simple symmetry. Practice frequently tested vectors and anomalies, chloromethane isomers, and ortho/meta/para-substituted benzene rings.
- Focus on Hydrogen Bonding & Fajan’s Rule: Master the criteria for polarising power and polarizability (charge density, pseudo-inert gas configuration) to predict covalent character, melting points, and solubility, alongside the physical property impacts of intermolecular vs. intramolecular H-bonding.
- Solve Past 5 Years' JEE Main PYQs: This chapter has a high density of repeated patterns (example, isoelectronic/isostructural species, coordinate bonds in oxyacids). Solving PYQs from 2021 to 2026 will cover nearly every standard question model and help you understand the JEE Mains 2027 high weightage topics.
Commonly asked questions
NO, it is compulsory to attempt all questions in the JEE Main exam. The JEE Main exam has negative marking and candidates must answer only those questions for which they know the correct answer. Students must note that there are no minimum marks in JEE Main that students need to score. Students gets All India Rank based on the marks they secure in exam and gets admission based on that rank.
Yes, JEE Main exam has negative marking. 1 mark is deducted for every incorrect answer.
Yes, and in fact, in the JEE Main exam, the weightage of class 11 and topics is almost the same. Candidates have to study topics of both classes 11 and 12 with equal importance.
Paper 1 has 75 questions where Physics Chemistry and Mathematics, each section has 25 questions. Out of 25 questions, 20 are MCQs and five are numerical value questions. You must answer all 5 numerical value-type questions. All 20 multiple-choice questions are compulsory. Complete all 75 questions in 3 hours.
High Probability JEE Main 2027 Chemical Bonding and Molecular Structure Questions
Candidates can expect questions from the following topics in the JEE Main 2027 exam:
- MOT: Almost every single shift contains at least one question directly testing MOT configuration (electronic filling up to 20 electrons).
- Mixed Concept Matching: Questions frequently combine VSEPR geometry with Dipole Moment (example: "Which of the following square planar molecules has a net zero dipole moment?").
- Counting Questions: Numerical value sections heavily favour counting queries, such as total lone pairs present on central atoms in a given list of 4 - 5 interhalogen/xenon compounds.
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| Top Colleges | Tuition Fee |
|---|---|
| Amity University, Noida | INR 11.4 lakh |
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If your JEE Main score is not strong, Galgotias University can be a practical option to consider. It offers multiple B.Tech programmes and gives preference to JEE Main scores while also allowing admission based on its programme-specific eligibility criteria. Compare fees, branch, curriculum, and opp
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According to the tentative schedule, JEE Main 2027 counselling registration is likely to commence in June 2027 after the conclusion of both exam sessions.
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The cutoff rank in Round 7 for BTech Computer Science & Engineering under General All India category is 53,013. It is the most competitive branch in the institute.
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Yes, JEE Main is compulsory for admission in B.Tech course at SGSITS.
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Getting into B.Tech CSE is straightforward. You need to have passed 10+2 with Physics and Mathematics, along with Chemistry, Biotechnology, Biology, or a Technical Vocational subject. Marks from boards like CBSE, ISC, and PSEB are accepted. JEE Main scores are also recognised under the RBUEdge Schol
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Yes, JEE Main scores are recognised under the RBUEdge Scholarship Program, so your entrance exam effort can also help reduce your fees. A higher score falls in a higher scholarship slab, with the top slab offering a 60% waiver on the course fee. This is a nice reward for the hard work that goes into
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The JEE Main Round 7 cutoff 2026 for SGSITS Indore ranged from 53,013 to 90,468 for General All India candidates across BTech branches.
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If a student has appeared for JEE Main, they can apply for B.Tech admission at Galgotias University through the university's admission process. JEE Main scores are considered for preference in the merit list, along with the eligibility requirements of the chosen B.Tech programme. After applying, the
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