COURSE STRUCTURE
CLASS–XI (THEORY) (2023-24) Time: 3 Hours Total Marks70
| U.No | Unit | Period | Marks |
| 1 | Some Basic Concepts of Chemistry | 12 | 7 |
| 2 | Structure of Atom | 14 | 9 |
| 3 | Classification of Elements and Periodicity in Properties | 8 | 6 |
| 4 | Chemical Bonding and Molecular Structure | 14 | 7 |
| 5 | Chemical Thermodynamics | 16 | 9 |
| 6 | Equilibrium | 14 | 7 |
| 7 | Redox Reactions | 6 | 4 |
| 8 | Organic Chemistry: Some basic Principles and Techniques | 14 | 11 |
| 9 | Hydrocarbons | 12 | 10 |
| Total | 110 | 70 |
Unit I: Some Basic Concepts of Chemistry 12 Periods
General Introduction: Importance and scope of Chemistry.
Nature of matter, laws of chemical combination, Dalton’s atomic theory: concept of elements,
atoms and molecules.
Atomic and molecular masses, mole concept and molar mass, percentage composition,
empirical and molecular formula, chemical reactions, stoichiometry and calculations based on
stoichiometry.
Unit II: Structure of Atom 14 Periods
Discovery of Electron, Proton and Neutron, atomic number, isotopes and isobars. Thomson’s
model and its limitations. Rutherford’s model and its limitations, Bohr’s model and its
limitations, concept of shells and subshells, dual nature of matter and light, de Broglie’s
relationship, Heisenberg uncertainty principle, concept of orbitals, quantum numbers, shapes
of s, p and d orbitals, rules for filling electrons in orbitals – Aufbau principle, Pauli’s exclusion
principle and Hund’s rule, electronic configuration of atoms, stability of half-filled and
completely filled orbitals.
Unit III: Classification of Elements and Periodicity in Properties 08 Periods
Significance of classification, brief history of the development of periodic table, modern periodic
law and the present form of periodic table, periodic trends in properties of elements -atomic
radii, ionic radii, inert gas radii, Ionization enthalpy, electron gain enthalpy, electronegativity,
valency. Nomenclature of elements with atomic number greater than 100.
Unit IV: Chemical Bonding and Molecular Structure 14 Periods
Valence electrons, ionic bond, covalent bond, bond parameters, Lewis structure, polar character
of covalent bond, covalent character of ionic bond, valence bond theory, resonance, geometry
of covalent molecules, VSEPR theory, concept of hybridization, involving s, p and d orbitals and
shapes of some simple molecules, molecular orbital theory of homonuclear diatomic
molecules(qualitative idea only), Hydrogen bond.
Unit V: Chemical Thermodynamics 16 Periods
Concepts of System and types of systems, surroundings, work, heat, energy, extensive and
intensive properties, state functions.
First law of thermodynamics -internal energy and enthalpy, heat capacity and specific heat,
measurement of U and H, Hess’s law of constant heat summation, enthalpy of bond
dissociation, combustion, formation, atomization, sublimation, phase transition, ionization,
solution and dilution. Second law of Thermodynamics (brief introduction)
Introduction of entropy as a state function, Gibb’s energy change for spontaneous and nonspontaneous processes, criteria for equilibrium.
Third law of thermodynamics (brief introduction).
Unit VI: Equilibrium 14 Periods
Equilibrium in physical and chemical processes, dynamic nature of equilibrium, law of mass
action, equilibrium constant, factors affecting equilibrium – Le Chatelier’s principle, ionic
equilibrium- ionization of acids and bases, strong and weak electrolytes, degree of ionization,
ionization of poly basic acids, acid strength, concept of pH, hydrolysis of salts (elementary idea),
buffer solution, Henderson Equation, solubility product, common ion effect (with illustrative
examples).
Unit VII: Redox Reactions 06 Periods
Concept of oxidation and reduction, redox reactions, oxidation number, balancing redox
reactions, in terms of loss and gain of electrons and change in oxidation number, applications
of redox reactions.
Unit VIII: Organic Chemistry -Some Basic Principles and Techniques 14 Periods
General introduction, methods of purification, qualitative and quantitative analysis, classification
and IUPAC nomenclature of organic compounds. Electronic displacements in a covalent bond:
inductive effect, electromeric effect, resonance and hyper conjugation. Homolytic and heterolytic
fission of a covalent bond: free radicals, carbocations, carbanions, electrophiles and nucleophiles,
types of organic reactions.
Unit IX: Hydrocarbons 12 Periods
Classification of Hydrocarbons
Aliphatic Hydrocarbons:
Alkanes – Nomenclature, isomerism, conformation (ethane only), physical properties, chemical
reactions including free radical mechanism of halogenation, combustion and pyrolysis.
Alkenes – Nomenclature, structure of double bond (ethene), geometrical isomerism, physical
properties, methods of preparation, chemical reactions: addition of hydrogen, halogen, water,
hydrogen halides (Markovnikov’s addition and peroxide effect), ozonolysis, oxidation, mechanism
of electrophilic addition.
Alkynes – Nomenclature, structure of triple bond (ethyne), physical properties, methods of
preparation, chemical reactions: acidic character of alkynes, addition reaction of – hydrogen,
halogens, hydrogen halides and water.
Aromatic Hydrocarbons:
Introduction, IUPAC nomenclature, benzene: resonance, aromaticity, chemical properties:
mechanism of electrophilic substitution. Nitration, sulphonation, halogenation, Friedel Craft’s
alkylation and acylation, directive influence of functional group in monosubstituted benzene.
Carcinogenicity and toxicity
CHEMIGOD 