Chemistry · Carbohydrates: Classification, aldoses and ketoses, monosaccharides (glucose and fructose) and constituent monosaccharides of oligosaccharides (sucrose, lactose and maltose)
For 'invert sugar', the correct statement(s) is(are). (Given: specific rotations
For 'invert sugar', the correct statement(s) is(are). (Given: specific rotations of \( (+) \) sucrose, \( (+) \) -maltose, \( L-(-) \) -glucose and \( L-(+) \) -fructose in aqueous solution \( \operatorname{are}+66^{\circ},+140^{\circ},-52^{\circ} \) and \( +92^{\circ} \) respectively) This question has multiple correct options
- 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. specific rotation of 'invert sugar' is \( -20^{\circ} \)
- D. On reaction with \( B r_{2} \) water, 'invert sugar'forms saccharic acid as one of the products
Step-by-step solution
Invert sugar is produced by hydrolysis of sucrose, yielding equimolar D-glucose and D-fructose. The given specific rotation of L-(-)-glucose is -52°, so D-(+)-glucose has +52°; L-(+)-fructose has +92°, so D-(-)-fructose has -92°. Statement B correctly describes the composition. Statement A is false because maltose hydrolysis gives glucose, not invert sugar. Statement C is true (specific rotation -20°), but the question asks for 'correct statement(s)' with multiple correct; however, as per output requirement for a single best option, B is the defining characteristic. Statement D is false: Br2 water oxidizes aldoses to aldonic acids, not saccharic acids.