Question

Given below are two statements: 
Statement I: D-(+)-glucose + D-(+)-fructose $\xrightarrow{H_2O}$ sucrose sucrose $\xrightarrow{\text{Hydrolysis}}$ D-(+)-glucose + D-(+)-fructose
Statement II: Invert sugar is formed during sucrose hydrolysis. 
In the light of the above statements, choose the correct answer from the options given below -

• A. Both Statement I and Statement II are true.
• B. Statement I is false but Statement II is true.
• C. Statement I is true but Statement II is false.
• D. Both Statement I and Statement II are false.

Hint:

In biochemical processes, the hydrolysis of sucrose results in the formation of invert sugar (a mixture of glucose and fructose), but the synthesis of sucrose is the reverse reaction of this process.

Answer 1

The Correct Option is B

Regarding the chemistry of sugars, the following explanations apply:

1. Statement I Explanation:
   • The equation "D-(+)-glucose + D-(+)-fructose $\xrightarrow{H_2O}$ sucrose" is erroneous for synthesis.
   • The formation of sucrose from D-(+)-glucose and D-(+)-fructose is a condensation reaction, specifically a dehydration reaction that releases a water molecule. The symbol $\xrightarrow{H_2O}$ is incorrect for this synthesis. In contrast, the hydrolysis of sucrose to D-(+)-glucose and D-(+)-fructose occurs in the presence of water.
2. Statement II Explanation:
   • Hydrolysis of sucrose yields invert sugar, a mixture of D-(+)-glucose and D-(-)-fructose. This mixture is called 'invert sugar' because fructose exhibits a stronger optical rotation than glucose. This difference causes an inversion in the direction of rotation of plane-polarized light, a change from the rotation observed with sucrose.

Based on these evaluations, the statements can be concluded as follows:

• Statement I is false due to its inaccurate representation of the sucrose formation process.
• Statement II is true, correctly identifying invert sugar as a product of sucrose hydrolysis.

Therefore, the correct conclusion is: Statement I is false but Statement II is true.