(CH₃)₂C=O --------^HCN,^H+--------> A-----^H₃O+-------->B

B-----^{H₂SO_4------->}C^{-----i) BH_3--THF ii)H₂O₂/OH-}-------->D

FIND A,B,C,D

'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