Glucose does not react with

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Question

(B) Glucose contains an aldehyde group $(-CHO)$ and multiple hydroxyl groups $(-OH)$.It reacts with $Phenyl  hydrazine$ to form glucosazone.It reacts

Vedclass · Accepted Answer

$2,4-DNP$ ($2$,$4$-Dinitrophenylhydrazine)

Vedclass · Answer

(B) Glucose contains an aldehyde group $(-CHO)$ and multiple hydroxyl groups $(-OH)$.It reacts with $Phenyl  hydrazine$ to form glucosazone.It reacts with $CH_3OH/H^+$ to form methyl glucoside.It reacts with $HCN$ to form cyanohydrin.However,glucose does not react with $2,4-DNP$ (Brady's reagent),which is a characteristic test for aldehydes and ketones. This is because the aldehyde group in glucose exists primarily in the cyclic hemiacetal form,which is not free to undergo the nucleophilic addition reaction required for $2,4-DNP$ formation.

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