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JEE Advanced 2016Paper 2
Exam
JEE Advanced
Year
2016
Paper
Paper 2
Subject
Chemistry
Chapter
Biomolecules

JEE Advanced 2016 · Paper 2 · Chemistry · Biomolecules

For 'invert sugar', the correct statement(s) is (are) (Given:...

For 'invert sugar', the correct statement(s) is (are)
(Given: specific rotations of (+)−\left(+\right) -sucrose, \left(+\right) -maltose,maltose,L - \left(-\right) -glucoseandglucose andL - \left(+\right) -fructoseinaqueoussolutionarefructose in aqueous solution are+ {66}^{°}, + {140}^{°}, – {52}^{°} and + {92}^{°}$, respectively)For 'invert sugar', the correct statement(s) is (are) (Given: specific rotations of (+) - sucrose, (+) - maltose, L -For 'invert sugar', the correct statement(s) is (are) (Given: specific rotations of (+) - sucrose, (+) - maltose, L -

Options

  1. A'invert sugar' is prepared by acid catalyzed hydrolysis of maltose.
  2. B'invert sugar' is an equimolar mixture of D−(+)D - \left(+\right) glucose and D−(−)−D - \left(-\right) - fructose.
  3. Cspecific rotation of 'invert sugar' is −20o- {20}^{o}.
  4. Don reaction with Br2{Br}_{2} water, 'invert sugar' forms saccharic acid as one of the products.

Correct answer

B. 'invert sugar' is an equimolar mixture of D−(+)D - \left(+\right) glucose and D−(−)−D - \left(-\right) - fructose.

Step-by-step solution

Invert sugar is an equimolar mixture of D−D -glucose and D−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,+52o+(−92o)2=−20o\dfrac{+ {52}^{o} + \left(- {92}^{o}\right)}{2} = - {20}^{o}
For 'invert sugar', the correct statement(s) is (are) (Given: specific rotations of (+) - sucrose, (+) - maltose, L -

(specific rotation +52°+ 52 °) +D−+ D -fructose (specific rotation −92°- 92 °) Sucrose specific rotation +66°+ 66 °

For 'invert sugar', the correct statement(s) is (are) (Given: specific rotations of (+) - sucrose, (+) - maltose, L -

D−fructose→Br2,H2ONoreactionD - fructose\overset{B{r}_{2}, {H}_{2}O}{\to}Noreaction.

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