JEE Main 202623 JanuaryMorning Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 23 January
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Biomolecules
JEE Main 2026 · 23 January · Morning Shift · Chemistry · Biomolecules
From the given following (A to D) cyclic structures, those which...
From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are :
Options
- AA and B
- BA and D
- CB and D
- DB and C
Correct answer
D. B and C
Step-by-step solution
Tollen's reagent reacts with free aldehydes.
Structure A is a hemiacetal (reducing sugar) that exists in equilibrium with its open-chain aldehyde form, allowing it to react with Tollen's reagent.
Structure B is a glycoside (methyl glycoside or similar), where the anomeric carbon is locked in an acetal/ketal form with an -OCH₃ group, preventing ring opening and aldehyde formation, so it cannot react with Tollen's.
Structure C has a cyclic ether oxygen and lacks a free aldehyde group that can be generated under mild conditions, preventing reaction with Tollen's.
Structure D is a hemiacetal form of a reducing sugar with a free anomeric -OH, allowing equilibrium with the aldehyde form and reaction with Tollen's.
Structures B and C do not react with Tollen's reagent.
Structure A is a hemiacetal (reducing sugar) that exists in equilibrium with its open-chain aldehyde form, allowing it to react with Tollen's reagent.
Structure B is a glycoside (methyl glycoside or similar), where the anomeric carbon is locked in an acetal/ketal form with an -OCH₃ group, preventing ring opening and aldehyde formation, so it cannot react with Tollen's.
Structure C has a cyclic ether oxygen and lacks a free aldehyde group that can be generated under mild conditions, preventing reaction with Tollen's.
Structure D is a hemiacetal form of a reducing sugar with a free anomeric -OH, allowing equilibrium with the aldehyde form and reaction with Tollen's.
Structures B and C do not react with Tollen's reagent.