Can u suggest any reaction name for this above reaction plzz see the attachment and answer today it's very urgent for me.or any hint how to solve this reaction

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

 

Using above information

Match the following 

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

how to represent the possible fischer projections for 2-bromohexane