About this previous year paper
This question paper evaluates understanding of molecular orbital theory, stereochemistry, spectroscopy (UV & NMR), polymer chemistry, water treatment, corrosion science, and organic reaction mechanisms.
It is divided into three sections: short definitions, descriptive answers, and long analytical questions.
SECTION – A (10 × 2 = 20 Marks)
This section contains ten brief questions requiring short explanations or definitions.
Topics include:
Paramagnetic nature of O₂ on the basis of MOT
Isomerism in maleic vs fumaric acids
Chemical shift in NMR
Chromophore & auxochrome in UV spectroscopy
Inductive effect (with examples)
Stability of benzyl vs ethyl carbocation
Reverse osmosis & Calgon treatment
Disadvantages of scale formation
Organic synthesis of propyne/propene type compounds from acetylene
Addition vs condensation polymerisation
This section checks basic conceptual clarity in organic, physical, and environmental chemistry.
SECTION – B (5 × 10 = 50 Marks)
Students must attempt any five medium-length, descriptive answers.
Topics include:
Molecular Orbital diagrams & bond orders of He₂⁺, O₂, NO, HF, N₂
Optical isomerism in molecules with two chiral centres
Beer–Lambert law + calculation of absorptivity & molar absorptivity
Mechanism of SN1 and SN2 reactions
Ion-exchange method for softening of water
Notes on reverse osmosis and boiler corrosion
Galvanization of iron & its corrosion-preventive mechanism
Ziegler–Natta catalyst and its role in polymerization
This section tests theory, chemical calculations, stereochemistry, reaction mechanisms, and industrial chemistry concepts.
SECTION – C (2 × 15 = 30 Marks)
Students must attempt any two long-answer questions.
Topics include:
Corrosion & Hardness
Corrosion inhibitors: anodic vs cathodic
Reasons for expressing hardness as CaCO₃ equivalent + other units
Stereochemistry & Polymers
Enantiomers vs diastereomers
Racemic mixture vs meso compounds
Preparation, properties, and uses of silicone rubber, PMMA, and Bakelite
Spectroscopy & Reaction Kinetics
Principle & applications of NMR in structure elucidation
Derivation of second-order rate law (for two different reactants)
This section evaluates deep problem-solving, chemical reasoning, and advanced conceptual knowledge.