if in a chain of six carbon atoms, carbon no. 2 from left is having one metyl group & carbon no. 3 is having one Br group then what will be its relation with its that isomer in which Br has same position but methyl is on 3 rd carbon atom?

'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