If you buy a good reference for JEE MAIN then in it there are all details about the chapter as well as imp topics?

There is considerable weightage devoted for Biomolecules and Molecular structure for JEE Mains.

Around 7.33% is soecified weightage out of 120 marks.

The tooics included in this weightage are Ionic Covalent bonding and Bobd parameters,
VSEPR theory, valence bond theory and Hybridization, mooecular orbit theory.
Leavibg this in option is bit risky, you should rather go for Doubt solving worh coaching Institution or your college faculty.

Every chapter is important and leavibg particular chapter is simply not recommended.

As per JEE Main 2017, the wieightage recorded were as follows:-

Inorganic Chemistry 20%
Organic chemistry.    40%
Physical Chemistry.  40%

So Accordingly you should devote your stidies and Planning strategies for a successful attempt.

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