The compound C₄H₁₀O₄ reacts with acetic anhydride to give a derivative with the formula C₁₂H₁₈O₈. Then find the number of OH group present in original substance.

'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