Hello,
In my opinion each and every chapter is more or less important for preparation.You can prepare for jee from ncert book first then you can try another books...you can visit the below given link for more details regarding important chapters of chemistry:
https://googleweblight.com/i?u=https://engineering.careers360.com/articles/jee-main-preparation-tips-for-chemistry&grqid=-DogDTNN&hl=en-IN
All the best!:)

Listed below are the important topics for JEE Main subject wise based on previous years papers.

Important Topics For JEE Main Chemistry:
Chemical Bonding & the periodic table  This is by far the most fundamental and the most important topics in Chemistry. If you can master Chemical Bonding and the properties of periodic table elements, then Chemistry will be an easy subject for you over many years to come.

Carbonyl Compounds & their derivatives

Redox reactions, Mole Concept & the concept of equivalents

Solid state, solutions & gases theory

Thermochemistry & the Second Law of Thermodynamics

Joint Entrance Examination (Main)

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