hello aspirant..
the 12 th board exam have most weightage of marks in the organic chemistry section for the chemistry exam. the weightage is about 46% for the board exam. among them the most preferred chapters are the amines, haloalkanes and haloarenes and the aldehydes and ketones. these keep varying in weightage the other chapter also have the similar weightage but a little lesss.
hope this helps
all the best
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