(B) $Glucose$ $(C_6H_{12}O_6)$ and $fructose$ $(C_6H_{12}O_6)$ have the same molecular formula but differ in their functional groups. $Glucose$ contai

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(B) $Glucose$ $(C_6H_{12}O_6)$ and $fructose$ $(C_6H_{12}O_6)$ have the same molecular formula but differ in their functional groups. $Glucose$ contains an aldehyde group $(-CHO)$,whereas $fructose$ contains a ketone group $(>C=O)$. Therefore,they are functional isomers.