I have a confusion here .Why option (a) have minimum enol content.According to me enol content is related to stability ,so only compound a is undergoing resonance so it must have a maximum resonating structure ,but the reverse happens here.Please explain me if stability is not the factor which determine enol content or I am wrong??

'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