CH₃-CO-C⁺H₂ have resonace structure and CH₃-C⁺H₂ have 3 hyperconjugation structure then which carbocation is more stable??Please help me by giving answer

'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