57. Which one of the nitrogen atoms in is the most nucleophilic? H2N-NH-c=O ' 1) I NH2 2) III 3) All three nitrogen atoms are equally strong nucleophilic centers 4) II

'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