Convert 1)Toluene to p-toluidine 2)p-toluidine diazonium chloride top-toluic acid 3)nitrobenzene to acetanilide 4)Acetanilide to p-nitroaniline

'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