Hello my friend,

If you are looking for important chapters of chemistry for JEE then refer following some topics :

chemical bonding,

periodic table,

carbonyl compounds and their derivatives,

Redox reactions, Mole concept and the concept of equivalents,

solid state, solutions and gases theory,

thermochemistry and the second law of thermodynamics,

Hope this will help you, all the best.

Some topics of class 11 chemistry that are quite important from the point of view of JEE questions are

• Chemical Bonding
• Chemical Equilibrium
• Gaseous State
• Atomic Structure
• General Organic Chemistry
• Stoichiometry.

For more info do check out this link

https://engineering.careers360.com/articles/most-important-chapters-of-jee-main