Plzz help..Its a big doubt..

In nomenclature for aromatic compounds , when do we use phenyl. Is its C6H5 or any side chain on the ring compound..

Is its for side chain , then if NO2 group is there on the ring , why we write nitrobenzene & not phenylbenzene?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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Plz answer this query.....................................................................................................

how to represent the possible fischer projections for 2-bromohexane