I wanna buy a book of organic chemistry.There are 3 books by M.S. Chouhan.I am confused which one to buy Organic Chemistry for JEE Main and Advanced by Solomons and Fryhles or Elementary Problems in Organic Chemistry or Advanced Problems in Organic Chemistry.I want a book which has good level and many questions and moreover suitable for both JEE Mains and JEE Advance.

'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