DO ALL THE QUESTIONS OF NCERT OF CH ORGANIC AND HYDROCARBONS IT WILL BE VERY HELPFULL FOR YOU IN YOUR EXAM....

However, I can provide you with some important topics and concepts in Class 11 Chemistry CBSE that students often find challenging.

1. Atomic Structure:
- Bohr's model of an atom and its limitations
- Quantum mechanical model of an atom
- Electronic configuration and quantum numbers
- Aufbau principle, Pauli exclusion principle, and Hund's rule

2. Chemical Bonding:
- Types of chemical bonds: ionic, covalent, and metallic bonds
- Lewis dot structure and octet rule
- VSEPR theory and molecular geometry
- Hybridization and its types (sp, sp2, sp3)

3. States of Matter:
- Three states of matter: solid, liquid, and gas
- Interparticle forces and their effects on physical properties
- Behavior of gases: gas laws (Boyle's law, Charles' law, etc.)
- Ideal gas equation and its applications

4. Thermodynamics:
- Concept of energy and its various forms
- Laws of thermodynamics (first, second, and third)
- Enthalpy and entropy changes in chemical reactions
- Spontaneity and Gibbs free energy

5. Equilibrium:
- Chemical equilibrium and reversible reactions
- Equilibrium constant (Kc and Kp)
- Le Chatelier's principle and its applications
- Factors affecting equilibrium (temperature, concentration, pressure)

6. Redox Reactions:
- Oxidation and reduction reactions
- Balancing redox equations (using oxidation numbers and half-reactions)
- Electrochemical cells and their applications
- Nernst equation and cell potential

7. Organic Chemistry:
- Basics of organic compounds and their classification
- Functional groups and their properties
- Isomerism and its types (structural, stereoisomerism)
- Nomenclature and reactions of hydrocarbons

Remember, these are just some important topics in Class 11 Chemistry CBSE, and there is much more to explore. It is recommended to refer to your textbook, class notes, and practice previous year's question papers to excel in the subject.