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D-glucose is an aldohexose ? Why does it...

D-glucose is an aldohexose ? Why does it react with HCN but not with `NaHSO_(3)` ?

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D-glucose exists cyclic forms `alpha` - and `beta`- in which the aldehydic group is involved in the formation of a ring and is not free. Therefore, it does not react with `NaHSO_(3)`. However, with reagents like HCN and phenylhydrazine, the ring structure cleaves and the aldehydic group becomes free. Therefore, D-glucose does react with HCN.
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Knowledge Check

  • Glucose does not react with

    A
    pure HCN
    B
    Schiff s reagent
    C
    `NaHSO_(3)`
    D
    all of these

  • Glucose does not react with

    A
    `Br_(2)//H_(2)O`
    B
    `H_(2)NOH`
    C
    `HI`
    D
    `NaHSO_(3)`

  • Glucose does not react with

    A
    `C_(6) H_(5) NHNH_(2)`
    B
    `NaHSO_(3)`
    C
    `HCN`
    D
    `NH_(2)OH`

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