Compound A has formula C9div3N and forms phthalicacid with KMnO4 /OH-.it forms compound with( COOC2H5)2 which gets decomposed by KOHthe possible structure of compound is?

'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