Specific rotation of $(+)$ sucrose, $(+)$ maltose, L (-) glucose, L (+) fructose in aqueous solution are $+ 66 °, + 140 °, 52 °$ and $+ 92 °$ respectively. For 'invert sugar', the correct statements are
a. 'Invert sugar' is prepared by acid-catalyzed hydrolysis of maltose
b. 'Invert sugar' is an equimolar mixture of $D (+)$ glucose and $D (-)$ fructose
c. The specific rotation of 'invert sugar' is $20 °$
d. In reaction with ${Br}_{2}$ water 'inverted sugar' forms saccharic acid as one of the products

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a and c

b and c

a and d

a and b

answer is B.

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Detailed Solution

Sucrose is called as invert sugar which on hydrolysis gives an equimolar mixture of (+)glucose and (-)fructose the reaction is given by-

$Sucrose Hydrolysis \to D (+) - glucose [α] = (- 52 °) + D (-) fructose [α] = (+ 92 °)$

Net-specific rotation of the equimolar solution is as follows

$= \frac{52 - 92}{2} = - 40 / 2 = - 20$

Hence option B is the correct answer.

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