CHE-009 IGNOU Guess Paper 2026-27

CHE-009 (Chemistry) Guess Paper 2026-27 (Term-End Exam Focus)

This structured guess paper aligns with IGNOU’s official CHE-009 syllabus, emphasizing high-weightage topics from past TEE sessions (June & Dec). It includes solved question patterns, chapter-wise distribution, and time-management strategies for a 3-hour exam.

Key Syllabus Blocks & Question Weightage

• Unit 1: Atomic Structure and Chemical Bonding
  • Focus areas: Quantum numbers, molecular orbital theory, VSEPR, and hybridization (20-25% weightage).
  • Expected questions: Short-answer derivations (e.g., MO diagrams for diatomic molecules), numericals on bond angles, and MCQs on electron configurations.
• Unit 2: Thermodynamics and Kinetics
  • Key topics: Gibbs free energy, reaction rates (Arrhenius equation), catalysis, and collision theory (25-30%).
  • Common trends: Numerical problems on ΔG°, activation energy calculations, and mechanism-based questions (e.g., SN1 vs. SN2).
• Unit 3: Organic Reaction Mechanisms
  • Critical areas: Electrophilic/nuclophilic additions, elimination reactions, and stereochemistry (carbanion stability, Markovnikov’s rule) (20-25%).
  • Past patterns: Mechanism-based questions (e.g., SN1/SN2 of halides), prediction of major products, and resonance structures.
• Unit 4: Coordination Chemistry and Bioinorganic Principles
  • High-weightage topics: Ligand field theory, isomerism (geometric/optical), and spectrochemical series (15-20%).
  • Frequent questions: Naming complexes, CFSE calculations, and VBT explanations for magnetic properties.
• Unit 5: Molecular Spectroscopy and Analytical Techniques
  • Focus: UV-Vis, IR, NMR basics, and mass spectrometry (10-15%).
  • Trends: Interpretation of spectra (e.g., splitting patterns in NMR), identification of functional groups from IR data.

Exam Time Management Tips (3-Hour Format)

• Allocate 45 minutes for numerical problems (Units 2 & 3) to avoid calculation errors.
• Spend 20-25 minutes on mechanism-based questions (Unit 3) to ensure clarity in electron-pushing logic.
• Prioritize coordination chemistry (Unit 4) for quick 5-10 mark questions (e.g., naming, VBT).
• Save 15 minutes for reviewing answers, especially for stereochemistry (Unit 3) and spectroscopy (Unit 5).

Subject-Specific FAQs

Focus on substrate type (tertiary favors SN1), nucleophile strength (strong nucleophiles favor SN2), and solvent polarity (polar protic solvents favor SN1). Always draw energy profiles and highlight the rate-determining step.

Ensure you use ΔG° = ΔH° TΔS° with correct units (kJ/mol). Avoid mixing ΔG and ΔG°; always specify standard conditions (1 atm, 298K). Verify entropy (ΔS°) signs (positive for gas evolution, negative for condensation).