pls tell me about any good book (except morrison boyd)or any website from where i could read stereochem. i am not able to identify all no. of stereoisomers of any compound so tell me that book which contain all basic concepts and good ques.

'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