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Glycoside Formation

+-Sucrose has...

Question

(+)-Sucrose has a specific rotation of +66.5, while D-(+)-glucose and D-(-)-fructose have specific rotations of +52.5 and -92.4 respectively. After complete hydrolysis of (+)-sucrose by dilute acid, what will be the specific rotation of the hydrolysis product, called invert sugar [a 1 : 1 mixture of D-(+)-glucose and D-(-)-fructose] ?

A

-39.9

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B

-72.4

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C

-19.9

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D

-34.9

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Solution

The correct option is C -19.9
specific rotation of the hydrolysis product is
$(- 92.4 + 52.5) / 2 = - 19.9$

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Q. (+)-Sucrose has a specific rotation of +66.5, while D-(+)-glucose and D-(-)-fructose have specific rotations of +52.5 and -92.4 respectively. After complete hydrolysis of (+)-sucrose by dilute acid, the specific rotation of the hydrolysis product, called invert sugar [a 1 : 1 mixture of D-(+)-glucose and D-(-)-fructose] is

- x

.
the nearest integer value of

x

Q. For ‘invert sugar’, the correct statement(s) is/are:
(Given: Specific rotations of (+)-sucrose, (+)-maltose, L-(–)-glucose and L-(+)-fructose in aqueous solution
are

+ 66^{o}, + 140^{o}, - 52^{o}

+ 92^{o}

Q. Sucrose (+) on hydrolysis gives a mixture of D-(+) glucose,

[α]_{D} = {52.7}^{o}

and D-() fructose = 92.4, known as invert sugar. Calculate the rotation of mixture, i.e., invert sugar :

Q. For 'invert sugar', the correct statement(s) is/are:
(Given: specific rotations of (+)-sucrose, (+)-maltose, L-(-)-glucose and L-(+)-fructose in aqueous solution are

+ 66^{\circ}, + 140^{\circ}, - 52^{\circ} a n d + 92^{\circ},

Q. Calculate the specific rotation of invert sugar given that

[α]_{D} = + {52.7}^{o}

for D-glucose and

[α]_{D} = - {92.4}^{o}

for D-fructose.

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