what is the correct order of enol content in the following compounds -

1. CH3COCH2CHO
2. CH3COCH3
3. CH3CHO
4. CH3COCH2COCH3

'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