AIIMS 2019 Chemistry Structure of Glucose MCQ Question
Assertion : The penta-acetate of glucose does not react with hydroxylamine.
Reason : This is because free aldehyde group is not present in penta-acetate.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The penta-acetate of glucose does not react with hydroxylamine because the cyclic form of glucose (α or β-D-glucopyranose) has its aldehyde (–CHO) group converted into a hemiacetal, which is not free to react. Hydroxylamine specifically reacts with free aldehydes and ketones to form oximes; since the –CHO group is not available in the cyclic structure, the reaction does not occur. Other options are not applicable as they do not provide relevant information or alternatives regarding the reactivity of glucose derivatives. Understanding this concept highlights the importance of structural changes in carbohydrates and their reactivity patterns.
Found an issue with this question?