How to convert:

1.Toulene to benzylalcohol

2.Ethanol to but-1-yne

3.Isopropyl alcohol to iodoform

4.tert-Butyl bromide to isobutyl bromide

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

 

Using above information

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how to represent the possible fischer projections for 2-bromohexane