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Sucrose

Sucrose + on ...

Question

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 :

A

- {19.9}^{o}

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B

+ {19.9}^{o}

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C

- {21.4}^{o}

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D

+ {21.4}^{o}

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Solution

The correct option is A $- {19.9}^{o}$
We know that 1 mole of sucrose yields 1 mole of glucose and 1 mole of fructose. Hence, the specific rotation of mixture will be one half of the sum of the specific rotation of the two monosaccharides.
$[α]_{D}$ of invert sugar $\frac{1}{2} [{52.7}^{o} + ({92.4}^{o})] = - {19.9}^{o}$

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Similar questions

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},

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. 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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