JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Biomolecules

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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.✓ Correct
  3. (C)Statement I is true but Statement II is false.
  4. (D)Both Statement I and Statement II are false.

Answer: (B)

Solution

Sucrose is built from D-(+)-glucose and D-(+)-fructose, but its hydrolysis gives D-(+)-glucose and D-(-)-fructose, not D-(+)-fructose, so the first statement as written is wrong. The equimolar mixture of D-(+)-glucose and D-(-)-fructose formed on hydrolysis rotates plane-polarised light to the left while sucrose rotates it to the right, and this reversal of sign is why the mixture is called invert sugar, so the second statement is correct. The first statement is false while the second is true.

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Single correct option

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