i know -I effect ​of halogens dominates over +R in aromatic systems....is this the case with aliphatic ones too?

Also where is the positive centre when we calculate the dipole moment of vinyl chloride?

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'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