Arrange the following in increasing order of expected enol content

CH base 3COCH base 2CHO,

CH base 3COCH base 3, CH base 3CHO,

CH base 3COCH base 2COCH base 3

'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