Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives(1)o-nitrcphenol(2) p-nitrophenol (3) nitrobenzene (4)2,4,6-trinitrobenzene

'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