JEE Advanced2016ChemistryBiomoleculesActual
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)
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.
- Cspecific rotation of 'invert sugar' is - 20 o .
- Don reaction with Br 2 water, 'invert sugar' forms saccharic acid as one of the products.
Correct answer
B. 'invert sugar' is an equimolar mixture of D - + glucose and D - - - fructose.
Step-by-step solution
Invert sugar is an equimolar mixture of D - glucose and D - fructose, which is obtained by the hydrolysis of sucrose Specific rotation of mixture is the half of the sum of specific rotation of both components, + 52 o + - 92 o 2 = - 20 o (specific rotation + 52 ° ) + D - fructose (specific rotation - 92 ° ) Sucrose specific rotation + 66 ° D - f r u c t o s e → B r 2 , H 2 O N o r e a c t i o n .