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D(+) Glucose has melting point 146^(@)C ...

D(+) Glucose has melting point `146^(@)C` and specific rotation `[alpha]_(C)6(25)` is +`122^(@)C`. Another D(+) Glucose has melting `150^(@)`C and specific rotation `[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 decrease 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.

Mutarotation is characteristic feature of

A

Epimer

B

Enantiomer

C

Anomer

D

Ring chain isomer

Text Solution

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The correct Answer is:
C
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D(+) Glucose has melting point 146^(@)C and specific rotation [alpha]_(C)6(25) is + 122^(@)C . Another D(+) Glucose has melting 150^(@) C and specific rotation [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 decrease 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. For mannose the mutarotation can be shown in brief as follow:

D(+) Glucose has melting point 146^(@)C and specific rotation [alpha]_(C)6(25) is + 122^(@)C . Another D(+) Glucose has melting 150^(@) C and specific rotation [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 decrease 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-(+) glucopyrnsone found at equillibrium in the aqueous solution?

The specific rotation, [alpha] , is expressed as

Specific angle OF rotation

Dextrororatory bytan -2-ol has a specific rotation [alpha]_(D)^(25) =+13.52^(@) . A sample of butan -2-ol shows a specific rotation [alpha]_(D)^(25)=+6.72^(@) . Calculate the enantiomers excess (or optical purity) of the sample?

Magnitude of specific rotation of a compound is independent of :

The instrument used for measuring specific rotation is