AIIMS 2018 Chemistry Anomeric Effect MCQ Question
Assertion : Boiling point of is less than .
Reason : is more stable than .
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
β-D-glucose is more stable than α-D-glucose because the hydroxyl group (–OH) on the anomeric carbon in β-D-glucose occupies an equatorial position, minimizing steric strain and torsional strain, while in α-D-glucose, the –OH group is in an axial position, leading to increased steric hindrance. This increased stability of β-D-glucose contributes to its higher boiling and melting points compared to α-D-glucose. Options B and C are incorrect because the stability and physical properties of these anomers can be clearly determined based on their conformations, and option D is irrelevant as it does not pertain to the question.
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