Please sir solve this question. I have a doubts in option a and b ,a was having resonance but b have 3 keto group. So how to determine which has maximum enolic content ,which character should we give preference more.Please explain in detail .

Please sir,reply as soon as possible

'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