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JEE Main 2026 Apr 5 Shift 2, Chemistry Q19: Carbohydrates

JEE Main2026Apr 5, Shift 2Chemistry
Q.

Given below are two statements:

Statement-I: The two cyclic structures shown below are two anomers of D-(+)-glucose.

and

Statement-II: The open chain forms of D-glucose and D-fructose contain three similar chiral carbons at , and .

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

    Both Statement-I and Statement-II are false.

  3. C

    Statement-I is true but Statement-II is false.

  4. D

    Statement-I is false but Statement-II is true.

Solution

Statement-I: The two structures differ only at C1 (the anomeric carbon); the OH at C1 is below the ring plane in -D-glucopyranose and above in -D-glucopyranose. These are anomers. True.

Statement-II: In D-glucose (an aldohexose) C2, C3, C4, C5 are stereocentres; in D-fructose (a ketohexose) C3, C4, C5 are stereocentres. At C3, C4, C5 the configurations are identical between the two sugars (both have the D-series pattern). True.

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