i've been finding organic chemistry an extremely difficult topic......i'm just not able 2 understand it........could u pls give me some tips regarding some imp subtopics in organic which is imp 4 answering jee xam.....so tht i can atleast be thorough in those topics.........nd also pls give some general tips regarding the preparation 4 da 2010 jee xam........

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane