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When either form of D-Glucose is dissolv...

When either form of D-Glucose is dissolved In water, the solution gradually changes its optical rotation and finally attains a constant optical rotation of `+52^(@)`.

Which form of D-GIucose is more stable?

A

`alpha`D-Glucose

B

`beta`D-Glucose

C

Open chain

D

All forms are equally stable

Text Solution

Verified by Experts

The correct Answer is:
B
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When either form of D-Glucose is dissolved In water, the solution gradually changes its optical rotation and finally attains a constant optical rotation of +52^(@) . Which of the following statements, is true?

When either form of D-Glucose is dissolved In water, the solution gradually changes its optical rotation and finally attains a constant optical rotation of +52^(@) . What is the percentage of open chain D-Glucose in solution?

Knowledge Check

  • When a metallic oxide is dissolved in water, then the solution formed has a high concentration of which ions

    A
    `H^(+)`
    B
    `H_(3)O^(+)`
    C
    `OH^(-)`
    D
    `M^(+)`

  • D (+) Glucose has melting point 146^@ C and specific rotation [alpha]_(D)^(25) is + 112^@ C. Another D(+) Glucose has melting point 150^@ C and specific rotational [alpha]_(D)^(25) is + 18.7^@ C. The two form have significantly different optical rotation but when an aqueous solution of either form is allowed to stand, it rotation changes. The specific rotation of one form decreases and rotation of other increases until both solution show the same value +52.7^@ . The change in rotation towards an equilibrium value is called mutarotation. What percentage of beta -D-(+) glucopyranose found at equilibrium in the aqueous solution?

    A
    `50%`
    B
    `~~100%`
    C
    `38%`
    D
    `64%`

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