Which of the following groups is divalent?

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(C) monovalent group is formed by removing one hydrogen atom from an alkane or arene,while a divalent group is formed by removing two hydrogen atoms f

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Benzal

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(C) monovalent group is formed by removing one hydrogen atom from an alkane or arene,while a divalent group is formed by removing two hydrogen atoms from the same carbon atom.$1$. Benzoyl group $(C_6H_5CO-)$ is monovalent.$2$. Benzyl group $(C_6H_5CH_2-)$ is monovalent.$3$. Benzal group $(C_6H_5CH=)$ is divalent,as it is derived by removing two hydrogen atoms from the methyl group of toluene $(C_6H_5CH_3)$.$4$. $p-$Tolyl group $(CH_3-C_6H_4-)$ is monovalent.

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