Organic Chemistry generally includes a significant weightage on the JEE Advanced exam. Typically 20-25% of the total marks are based on Organic Chemistry. Most questions tend to test conceptual understanding, reaction mechanisms, and functional change, thus grounding your study basis on these foundational principles will significantly enhance your chances during the exam and can help with highest overall marks.
The Basic Principles of Organic Chemistry provide the background for the advanced organic reaction mechanism, stereochemistry, and classes of organic compounds. These principles are important to do well on organic chemistry, and a solid understanding of these basic principles can boost your score on JEE Advanced.
Usually, the Organic Chemistry section is divided into Basic Principles and Reaction Mechanism and Physical Organic Chemistry. The weightage of organic chemistry changes a little year on year. The Basic Principles of Organic Chemistry weightage is generally around 5-7% of the total marks in the papers. The Basic Principles are very important as, with the help of some basic principles of organic chemistry, you can solve more difficult reaction mechanisms and predict what will happen to organic compounds in different conditions.
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Here are some of the important JEE Advanced previous year questions of Basic Principles of Organic Chemistry
Question 1:
The option(s) with correct sequence of reagents for the conversion of P to Q is(are)
Question 2:
On decreasing the pH from 7 to 2, the solubility of a sparingly soluble salt (MX) of a weak acid (HX) increased from 10-4 mol L-1 to 10-3 mol L-1. The pKa of HX is
Question 3:
50 mL of 0.2 molal urea solution (density = 1.012 g mL-1 at 300 K) is mixed with 250 mL of a solution containing 0.06 g of urea. Both solutions were prepared in the same solvent. The osmotic pressure (in Torr) of the resulting solution at 300 K is __.
[Use: Molar mass of urea = 60 g mol-1; gas constant, R = 62 L Torr K-1 mol-1; Assume, ΔmixH = 0, ΔmixV = 0]
Question 4:
The total number of sp2 hybridised carbon atoms in the major product P (a non-heterocyclic compound) of the following reaction is __.
Question 5:
In the following reactions, P, Q, R, and S are the major products. The correct statement(s) about P, Q, R, and S is(are)
Question 6:
A trinitro compound, 1,3,5-tris-(4-nitrophenyl)benzene, on complete reaction with an excess of Sn/HCl gives a major product, which on treatment with an excess of NaNO₂/HCl at 0°C provides P as the product. P, upon treatment with excess of H₂O at room temperature, gives the product Q. Bromination of Q in aqueous medium furnishes the product R. The compound P upon treatment with an excess of phenol under basic conditions gives the product S. The molar mass difference between compounds Q and R is 474 g mol⁻¹ and between compounds P and S is 172.5 g mol⁻¹. The number of heteroatoms present in one molecule of R is ______ .
Question 7:
50 mL of 0.2 molal urea solution (density = 1.012 g mL-1 at 300 K) is mixed with 250 mL of a solution containing 0.06 g of urea. Both solutions were prepared in the same solvent. The osmotic pressure (in Torr) of the resulting solution at 300 K is __.
[Use: Molar mass of urea = 60 g mol-1; gas constant, R = 62 L Torr K-1 mol-1; Assume, ΔmixH = 0, ΔmixV = 0]
Question 8:
The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match List-I with List-II and choose the correct option.
| List-I | List-II |
|---|---|
| (P) Etard reaction | (1) Acetophenone |
| (Q) Gattermann reaction | (2) Toluene |
| (R) Gattermann-Koch reaction | (3) Benzene |
| (S) Rosenmund reduction | (4) Aniline |
| (5) Phenol |
Question 9:
Plotting 1 / Λm against cΛm for aqueous solutions of a monobasic weak acid (HX) resulted in a straight line with y-axis intercept of P and slope of S. The ratio P/S is
Question 10:
A disaccharide X cannot be oxidised by bromine water. The acid hydrolysis of X leads to a laevorotatory solution. The disaccharide X is
Topic-Wise Weightage in Organic Chemistry
Organic Chemistry is an essential part of the JEE Advanced exam, with a significant number of questions being asked from this subject. Below is a breakdown of the weightage of important topics and the expected number of questions from each area in Organic Chemistry:
| Topic | Sub-Topics | Weightage (%) | Expected Number of Questions |
|---|---|---|---|
| Hydrocarbons | Alkanes, Alkenes, Alkynes, Aromatic Compounds, Reactions (Addition, Substitution, Elimination), Mechanisms (Electrophilic Substitution) | 15-20% | 3-4 |
| Functional Groups | Alcohols, Phenols, Ethers, Aldehydes, Ketones, Carboxylic Acids, Amines, Nitriles, Halides, Reaction Mechanisms (Nucleophilic Substitution, Electrophilic Addition) | 25-30% | 4-5 |
| Stereochemistry | Chirality, Optical Isomerism, Geometrical Isomerism, Cahn-Ingold-Prelog Rules, Enantiomers, Diastereomers, Racemic Mixtures | 10-12% | 2-3 |
| Reaction Mechanisms | SN1, SN2, Electrophilic Addition, Radical Mechanisms, Carbocation Stability, Rearrangements | 20-25% | 3-4 |
| Aromatic Compounds | Electrophilic Aromatic Substitution, Nitration, Sulfonation, Friedel-Crafts Reactions, Resonance Effects, Activating/Deactivating Substituents | 10-12% | 2-3 |
| Organic Synthesis and Named Reactions | Retrosynthetic Analysis, Multi-step Synthesis, Named Reactions (Grignard Reactionr>, Aldol Condensation, Wittig Reaction, etc.) | 10-15% | 2-3 |
JEE Advanced Exam Pattern
The JEE Advanced exam is considered as one of the top engineering entrance examinations in India, which takes place annually for enrollment at IITs and other top institutions to undergraduate programs. JEE Advanced consists of two compulsory papers, Paper 1 and Paper 2, each with three hours of duration. It challenges students’ knowledge of Physics, Chemistry and Mathematics. The exam consists of different question types including Multiple Choice Questions (MCQs), Numerical Value-based Questions and Assertion-Reasoning questions to evaluate the foundational knowledge of topics and ability to solve problems. Both papers have a total of 180 marks, with marks deducted for incorrect answers in a few question types.
| Aspect | Details |
|---|---|
| Mode | Computer-Based Test (CBT) |
| Papers | 2 (Paper 1 & Paper 2) – Both mandatory |
| Duration | 3 hours per paper (with break between papers) |
| Total Subjects | Physics, Chemistry, Mathematics (Equal weightage) |
| Total Questions | ~54–60 (18–20 per subject, split across question types) |
| Language | English & Hindi (option to switch during exam) |
The exam is known for its challenging nature and is conducted in English and Hindi. It is essential to clear the JEE Main exam before appearing for JEE Advanced.
Marking Scheme with Question types in JEE Advanced
Here is a detailed marking scheme for different questions in JEE Advanced exam.
| Question Type | Marks per Q | Negative Marking | Examples |
|---|---|---|---|
| Single Correct MCQ | +3 | -1 | Basic theory/direct formula questions |
| Multiple Correct MCQ | +4 (full) | -2 (if all wrong) / Partial marks* | "Which of the following is/are true?" |
| Numerical Value (NV) | +3 | No negative | Calculations (e.g., wavelength) |
| Paragraph-Based | Varies (2–4) | Depends on sub-type | Linked to a common scenario |
| Match the Following | +2 per match | -1 per wrong match | Column matching (e.g., graphs) |
Partial Marks: For Multiple Correct MCQs, +1 per correct option (if not all selected).
Subject-Wise Distribution
Here is the subject wise questions distribution in the JEE Advanced exam describing number of questions in each subject.
| Subject | MCQs | Numerical | Paragraph/Matching | Total |
|---|---|---|---|---|
| Physics | 6–8 | 4–5 | 2–3 | 12–16 |
| Chemistry | 6–8 | 4–5 | 2–3 | 12–16 |
| Maths | 6–8 | 4–5 | 2–3 | 12–16 |
Subject wise Syllabus: JEE Advanced 2025
Here is a quick syllabus of JEE Advanced 2025 subject wise which helps in preparation of the students. Check JEE Advanced Syllabus for a detailed Syllabus.
| Subject | Key Topics |
|---|---|
| Physics | Mechanics, Electrodynamics, Modern Physics, Optics, Thermodynamics, Error Analysis |
| Chemistry | Physical (Thermo, Kinetics), Organic (Reactions), Inorganic (Coordination, P-Block) |
| Maths | Algebra, Calculus, Coordinate Geometry, Trigonometry, Vectors |
Note:
- Physics: Focus on Modern Physics (20% weightage) & Electrodynamics.
- Chemistry: Organic reactions & Coordination compounds are high-scoring.
- Maths: Calculus (35% weightage) is most critical.
In addition to conceptual knowledge, you should practice multiple mock tests before your exam.
Check:
JEE Advanced Chemistry Paper Analysis (2024 & Trends)
The JEE Advanced Chemistry Paper evaluates candidates on their conceptual understanding, application skills, and problem-solving abilities in Physical, Organic, and Inorganic Chemistry. The exam consists of two papers (Paper 1 & Paper 2), each lasting 3 hours and containing 15–18 questions covering the entire syllabus. Questions range from theoretical concepts to numerical problems, with an emphasis on multi-disciplinary applications.
Overview (2024)
| Aspect | Details |
|---|---|
| Total Questions | 15–18 per paper (2 papers) |
| Difficulty | Moderate to Hard (30% easy, 40% moderate, 30% difficult) |
| Question Types | Single/Multiple MCQs, Numerical Value, Paragraph-based, Match-the-Column |
| Key Focus Areas | Thermodynamics, Organic Mechanisms, Coordination Compounds, Electrochemistry |
Chapter-Wise Weightage (2024)
| Topic | Weightage | Difficulty | Remarks |
|---|---|---|---|
| Thermodynamics | 15–20% | Moderate-Hard | Focus on Gibbs free energy, Hess’s Law, and numerical applications |
| Organic Mechanisms | 18–22% | Hard | Named reactions, stereochemistry, and reaction intermediates |
| Coordination Chem | 15–18% | Moderate | Isomerism, CFSE, spectrochemical series (NCERT-based but analytical) |
| Electrochemistry | 12–15% | Moderate-Hard | Nernst equation, conductance, battery-related problems |
| Chemical Kinetics | 10–12% | Moderate | Rate laws, Arrhenius equation, mechanism-based questions |
| Periodic Table | 8–10% | Easy-Moderate | Periodic trends, anomalies (e.g., 3rd period elements) |
| Biomolecules | 5–8% | Easy | Theory-based (carbohydrates, proteins, nucleic acids) |
| P-Block Elements | 10–12% | Moderate | NCERT-focused, but application-based questions on oxides and halides |
Difficulty Trends (2019–2024)
| Year | Difficulty Level | Key Observations |
|---|---|---|
| 2024 | Moderate-Hard | Increased numerical problems, integration of multiple concepts (e.g., Thermo + Kinetics) |
| 2023 | Moderate | Balanced theory and numericals; Organic Chemistry was lengthy |
| 2022 | Hard | Heavy emphasis on Physical Chemistry calculations and complex Organic mechanisms |
| 2021 | Very Hard | Unconventional Inorganic questions, tricky coordination chemistry problems |
| 2020 | Moderate | More NCERT-aligned, straightforward Organic and Physical Chemistry questions |
Key Takeaways for 2025
- Physical Chemistry: Strengthen numerical problem-solving in Thermodynamics, Electrochemistry, and Kinetics.
- Organic Chemistry: Master reaction mechanisms, named reactions, and stereochemistry.
- Inorganic Chemistry: Focus on NCERT (especially P-Block and Coordination Compounds) with analytical applications.
- Practice: Solve previous years’ papers (2021–2024) to understand evolving patterns.
JEE Advanced Previous Year Question Papers with Detailed Solutions
JEE Advanced 2024 Question Paper Pdf with Solutions
| Paper Name | Question Paper with Solutions |
|---|---|
| JEE Advanced 2024 Paper 1 Question Paper (English) | Check Solutions |
| JEE Advanced 2024 Paper 2 Question Paper (English) | Check Solutions |
| JEE Advanced 2024 Paper 1 Question Paper (Hindi) | Check Solutions |
| JEE Advanced 2024 Paper 1 Question Paper (Hindi) | Check Solutions |
| Architecture Aptitude Test | Check Solutions |
JEE Advanced Question Paper has 4 sections- Section 1 (Maximum marks-12), Section 2 (Maximum marks-12), Section 3 (Maximum marks- 24) and Section 4 (Maximum marks-12)
JEE Advanced 2023 Question Paper PDF Download With Solutions
| Paper | Answer Key PDF |
|---|---|
| Question Paper 1 PDF | Check Solutions |
| Question Paper 2 PDF | Check Solutions |
| Question Paper AAT PDF | Check Solutions |
JEE Advanced 2022 Question Paper
| 2022 Question Paper | PDF Download |
|---|---|
| Question Paper 1 PDF | Click here |
| Question Paper 2 PDF | Click here |
JEE Advanced 2021 Question Paper
| Question Paper | PDF Download | ||
|---|---|---|---|
| Question Paper 1 PDF | Physics | Chemistry | Maths |
| Question Paper 2 PDF | Physics | Chemistry | Maths |
JEE Advanced 2020 Question Paper
| Question Paper | PDF Download |
| Question Paper 1 PDF | Click here |
| Question Paper 2 PDF | Click here |
Frequently Asked Questions (FAQs)
Q1. How much weightage of organic chemistry in JEE Advanced?
Answer. In JEE Advanced, Organic Chemistry typically has an approximate weightage of 20-25% of the total marks in the Chemistry section. This weightage is inclusive of topics such as Basic Principles of Organic Chemistry, Hydrocarbons, Aldehydes, Ketones, and Carboxylic Acids, Aromatic Compounds, and Biomolecules, and others.
The exact weightage of marks or a percentage may change every year, but Organic Chemistry has always been a significant part of the exam. The questions that come under this section test your conceptual understanding and problem-solving skills based on reaction mechanisms, isomerism, functional groups, and their related reactivity patterns.
Q2. Is organic chemistry important for JEE Advanced?
Answer. Indeed, Organic Chemistry does hold considerable significance for JEE Advanced. Apart from possessing a considerable weightage of almost 20-25% of the total marks in JEE Advanced, it is an important subject in terms of scoring. The questions in Organic Chemistry are primarily based on centrals concept and different mechanisms of reacting, functional groups, isomerism and so on.
Moreover, Organic Chemistry can also be more scoring than a few other sections as it is not entirely memory-based and it relies more on application and logical thinking. If you know Organic Chemistry well, you will easily work through most Organic Chemistry problems, particularly related to mechanisms, naming compounds and predicting the products of a chemical reaction.
Q3. What are the basic principles of Organic Chemistry?
Answer. The Basic Principles of Organic Chemistry are:
- Inductive Effect: the effect of substituents on reactivity and stability, due to the electron-withdrawing or electron-donating effect through sigma bonds.
- Resonance Effect: Delocalization of pi-electrons in conjugated systems that stabilizes the molecule or reaction intermediate.
- Hyperconjugation: Interaction of sigma electrons with empty or partially filled adjacent orbitals that stabilizes carbocations, alkenes, and free radicals.
- These principles are the key to understanding the reactivity, stability, and behavior of organic compounds in reaction.
Q4. Is goc in class 11 or 12?
Answer. The subject of General Organic Chemistry (GOC) is usually presented in Class 11 in the syllabi of JEE Main and JEE Advanced. GOC lays the groundwork to understand organic chemistry including inductive effect, resonance, hyperconjugation, and the foundational rules of organic reactions. It is critical to understand GOC because all further topics presented in Class 12 such as Aldehydes, Ketones, Carboxylic Acids and Aromatic Compounds are derived from the GOC.
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