After prolonged treatment of (A) by D_2O/DO^- | vedclass

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(C) The compound $(A)$ is $2,5$-cyclohexadienone. In the presence of $D_2O/DO^-$, the $\alpha$-hydrogens (hydrogens at the $2, 3, 5, 6$ positions rela

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$4$

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(C) The compound $(A)$ is $2,5$-cyclohexadienone. In the presence of $D_2O/DO^-$, the $\alpha$-hydrogens (hydrogens at the $2, 3, 5, 6$ positions relative to the carbonyl group) are acidic and undergo keto-enol tautomerism, leading to $H/D$ exchange. In this specific molecule, there are $4$ such acidic hydrogen atoms at the positions adjacent to the double bonds and carbonyl group. Upon prolonged treatment, all $4$ hydrogen atoms are replaced by deuterium atoms. The mass difference is calculated as: $(4 	imes 	ext{mass of } D) - (4 	imes 	ext{mass of } H) = 4 	imes (2 - 1) = 4 \ u$.

After prolonged treatment of $(A)$ by $D_2O/DO^-$, the difference in molecular weights of compounds $(A)$ and $(B)$ is:

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