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(A) The reaction of glucose with phenylhydrazine involves the formation of an osazone derivative. One molecule of glucose reacts with $3$ molecules of

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$3$

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(A) The reaction of glucose with phenylhydrazine involves the formation of an osazone derivative. One molecule of glucose reacts with $3$ molecules of phenylhydrazine. The first molecule of phenylhydrazine reacts with the aldehyde group to form a phenylhydrazone. The second and third molecules of phenylhydrazine are involved in the oxidation of the $C-2$ carbon and the subsequent formation of the osazone structure. Thus,the balanced equation is: $C_6H_{12}O_6 + 3C_6H_5NHNH_2 \rightarrow C_{18}H_{22}N_4O_4 + C_6H_5NH_2 + NH_3 + 2H_2O$. Therefore,$x = 3$.

$A$ molecule of glucose reacts with $x$ molecules of phenylhydrazine to form osazone. The value of $x$ is.........

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