Hello Aspirant

There are many chapters in chemistry which are related to each other,  such as: -

1-XI Mole concept with XII Solutions: -  The mole concept is one of the topics with which you kick-off your preparation of physical chemistry in class 11. One of the reasons for it being taught earlier is that the concept of mole will be required in almost every other topic of physical chemistry that you study later, irrespective of the complexity of that topic. Apart from its relevance in chemistrys. Mole concept chapter deals with the calculation of molar mass,  mile formula, molecular mass and etc. This mole concept is directly used in solution chapter of class 12th , as it helps to solve the numericals. Since, we face many numericals in solution chapter which are directly solved on the basis of mole concept.

2-XI Basic Organic Chemistry with XII Chemistry full second book (organic chem. chapters): -: - class 11th organic chemistry deals with: - 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. All these topics directly help in class 12th organics.

3- XI Equilibrium with XII Electrochemistry : - Equilibrium deals with following topics: - 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, Henderson Equation, hydrolysis of salts (elementary idea), buffer solution, solubility product, common ion effect (with illustrative examples). All his helps in electrochemistry as,  we must know how to balance equation,  which compound is acid and base or which compound is strong acid/strong base or weak acid/weak base, how they dissociate and associate etc.

4-XI States of Matter with XII Solutions: - state of matter deals with following topics: - Three states of matter, intermolecular interactions, types of bonding, melting and boiling points, role of gas laws in elucidating the concept of the molecule, Boyle's law, Charles law, Gay Lussac's law, Avogadro's law, ideal behaviour, empirical derivation of gas equation, Avogadro's number, ideal gas equation. Deviation from ideal behaviour, liquefaction of gases, critical temperature, kinetic energy and molecular speeds (elementary idea)Liquid State- vapour pressure, viscosity and surface tension (qualitative idea only, no mathematical derivations).   Again, in solution chapter we have to face numericals which can be solved by using Avogadro's law, emperial formula. Boyle’s law, Charles law and Gay Lussac's law is also useful in this chapter.

5-XI Atomic Structure and Chemical bonding with XII p block, d & f block, coordination compounds: - Atomic structure deals with following topics: - 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. While in class 12th p block,  d block and coordination compound chapter is directly linked to atomic structure and chemical bonding for understanding the physical and chemical property of elements.

I hope my answer will help you. Thank you and all the best.