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JEE Main 2025 Apr 7 Shift 1, Chemistry Q18: Carbohydrates

JEE Main2025Apr 7, Shift 1Chemistry
Q.

Given below are two statements :

Statement I: D-(+)-glucose + D-(+) fructose sucrose

sucrose 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 -

  1. A

    Both Statement I and Statement II are true.

  2. B

    Statement I is false but Statement II are true.

  3. C

    Statement I is true but Statement II is false.

  4. D

    Both Statement I and Statement II are false.

Solution

Statement I analysis: Sucrose hydrolyses to D-(+)-glucose and D-()-fructose, not D-(+)-fructose. The sign of optical rotation flips for fructose during the hydrolysis. So the equation as written in Statement I is incorrect.

Statement II analysis: The hydrolysis mixture is called invert sugar because sucrose itself is dextrorotatory () whereas the equimolar product mixture is levorotatory (). The strong negative rotation of fructose () outweighs the positive rotation of glucose (), inverting the sign of net rotation. Statement II is correct.

Statement I is false, Statement II is true Option (2).

Concept behind this question

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