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(B) Vanillin is an organic compound with the molecular formula $C_8H_8O_3$. It is a phenolic aldehyde containing aldehyde,hydroxyl,and ether functiona

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$11$

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(B) Vanillin is an organic compound with the molecular formula $C_8H_8O_3$. It is a phenolic aldehyde containing aldehyde,hydroxyl,and ether functional groups.Structure analysis:$1$. Total number of oxygen atoms = $3$ (one in $-CHO$,one in $-OH$,and one in $-OCH_3$).$2$. Total number of $\pi$-bonds:- $3$ $\pi$-bonds in the benzene ring.- $1$ $\pi$-bond in the $C=O$ group of the aldehyde.- Total $\pi$-bonds = $4$.$3$. Total number of $\pi$-electrons = $4 	imes 2 = 8$.Sum of oxygen atoms and $\pi$-electrons = $3 + 8 = 11$.

Vanillin,a compound obtained from vanilla beans,has a total sum of oxygen atoms and $\pi$-electrons equal to . . .

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