Sure! Class 12 Chemistry covers a wide range of topics, including Organic Chemistry, Inorganic Chemistry, and Physical Chemistry. Here are some important formulas and concepts from each category:

**1. Organic Chemistry:**

a) **IUPAC Nomenclature:**
– Alkanes: CnH2n+2
– Alkenes: CnH2n
– Alkynes: CnH2n-2

b) **Isomerism:**
– Structural Isomerism
– Stereoisomerism (Geometric Isomers and Optical Isomers)

c) **General Reaction Types:**
– Addition Reactions
– Elimination Reactions
– Substitution Reactions

**2. Inorganic Chemistry:**

a) **Valence Shell Electron Pair Repulsion (VSEPR) Theory:**
– Helps predict molecular shapes based on the number of valence electrons and lone pairs around the central atom.

b) **Ionic Bonding:**
– Formation of ions (cation and anion) and ionic compounds.

c) **Covalent Bonding:**
– Sharing of electrons between atoms.

**3. Physical Chemistry:**

a) **Gas Laws:**
– Boyle’s Law: PV = constant
– Charles’s Law: V/T = constant
– Avogadro’s Law: V/n = constant
– Ideal Gas Law: PV = nRT

b) **Thermodynamics:**
– First Law of Thermodynamics: ΔU = q + w
– Enthalpy (H) and its relation to internal energy (U) and pressure-volume work (PΔV).

c) **Equilibrium:**
– Equilibrium Constant (Kc and Kp) expression
– Le Chatelier’s Principle

d) **Electrochemistry:**
– Nernst Equation: E = E° – (RT/nF) * ln(Q)
– Faraday’s Laws of Electrolysis

e) **Chemical Kinetics:**
– Rate Law: rate = k[A]^m[B]^n
– Integrated Rate Law for zero, first, and second-order reactions.

Please note that this is not an exhaustive list, and there are many more concepts and formulas to explore in each topic. Chemistry can be a fascinating subject, but it requires consistent practice and understanding of the underlying principles to excel. Make sure to consult your class textbooks and notes for a comprehensive list of formulas and concepts for your specific curriculum. Good luck with your studies!