I have absolutely no idea how to prepare for Organic Inorganic chemistry... when I have my IITJEE Exam day after tomrw?? Its ALMOST like I dont know anything in chemistry... Because it carries a lot of weightage..Please help me?!! Tell me what to do??!! ASAP!!Really need help!! :O

'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