Assertion (A): D(+)-Glucose is dextrorotatory in nature. ...

CBSE Class 12 Chemistry 2026 All Sets Solved Paper

Question : 13 of 16

Marks: +1, -0

Assertion (A): D(+)-Glucose is dextrorotatory in nature.

Reason (R): (+) represents dextrorotatory nature and D represents its configuration.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.

Solution:

Assertion (A):

D-Glucose is dextrorotatory in nature.

True — D(+)-Glucose rotates plane-polarized light to the right (clockwise).

Reason (R):

(+) indicates dextrorotation (rotation to the right).

True — D represents the configuration relative to D-glyceraldehyde (based on Fischer projection).

Since D(+)-glucose has both:

D configuration

Positive optical rotation

The reason correctly explains the assertion.

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