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Sucrose

Calculate the...

Question

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.

A

+ {19.9}^{o}

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B

- {19.9}^{o}

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C

+ {25.0}^{o}

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D

- {25.0}^{o}

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Solution

The correct option is B $- {19.9}^{o}$
Invert sugar is an equimolar mixture of D-glucose and D-fructose. It is obtained by the hydrolysis of sucrose. The specific rotation is one-half the sum of the of individual monosaccharides: $\frac{1}{2} [+ {52.7}^{o} + (- {92.4}^{o})] = - {19.9}^{o}]$

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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. 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.

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 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] ?

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},

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