Hello Dear

Inorder to fetch all those important topics in the Chemistry which is usually asked in the JEE mains for that below the link is given through which you can fetch that . In the description below the weightage of each and every topic has been mentioned.

https://engineering.careers360.com/articles/jee-main-important-topics-books

All the best

Hey Manjunath! JEE Main is a national level entrance exam so it usually covers all the topics from the syllabus, there is no specified topics that are asked more. The chemistry portion cover Physical chemistry, Inorganic chemistry and Organic chemistry all the three in specific amount. You can check the JEE Main syllabus and topic weightage in the official website. Hope this may help you. 

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