An organic compound (A) having molecular formula C3H7Cl on reaction with alcoholic solution of KCN gives compound B. The compound B on hydrolysis with dilute HCl gives compound C and C on reduction with H2/Ni gives 1-aminobutane. Identify A, B and C.[3]

'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