Osazone formation involves only 2 carbon atom | vedclass

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(A) The formation of osazone involves the reaction of $D-glucose$ with $3$ molecules of phenylhydrazine.First,$D-glucose$ reacts with one molecule of

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Chelation

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(A) The formation of osazone involves the reaction of $D-glucose$ with $3$ molecules of phenylhydrazine.First,$D-glucose$ reacts with one molecule of phenylhydrazine to form $D-glucose$ phenylhydrazone.Second,the second molecule of phenylhydrazine acts as an oxidizing agent,oxidizing the $C-2$ hydroxyl group to a keto group.Third,the third molecule of phenylhydrazine reacts with the newly formed keto group to form $D-glucosazone$.The involvement of only the first two carbon atoms is due to the formation of a stable chelated structure (hydrogen bonding) between the phenylhydrazone group at $C-1$ and the imine group at $C-2$,which prevents further reaction with other hydroxyl groups.

Osazone formation involves only $2$ carbon atoms of glucose because of

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