JEE Advanced 2016 · Paper 2 · Chemistry Q30

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ChemistryMultiple correct+4 / -2Question 30 of 54

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°, +140°, −52° and +92°, respectively)

'invert sugar' is prepared by acid catalyzed hydrolysis of maltose

'invert sugar' is an equimolar mixture of D-(+)-glucose and D-(−)-fructose

specific rotation of 'invert sugar' is −20°

on reaction with

\ce{Br2}

water, 'invert sugar' forms saccharic acid as one of the products

Answer and worked solution

Official answer: B, C

(A) Invert sugar comes from hydrolysis of sucrose, not maltose. False.
(B) It is an equimolar mixture of D-(+)-glucose and D-(−)-fructose. True.
(C) The D-sugars have rotations opposite to the given L-values: +52° and −92°. The mixture has $\frac{52-92}2=-20°$ . True.
(D) Bromine water oxidises glucose to gluconic acid, not to saccharic acid (that needs HNO₃). False.

(B), (C)

Topics:Carbohydrates

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JEE Advanced 2016 · Paper 2, Chemistry question 30