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Biomolecules · Question 17

JEE Main 2026 (Online) 23rd January Morning ShiftMCQMedium📈 Topic in 26% papers+4−1
1

From the given following (A to D) cyclic structures, those which will not react with Tollens' reagent are: [figure]

  1. A and D
  2. A and B
  3. B and D
  4. B and C

Answer

(4) B and C

Solution

A sugar reduces Tollens' reagent only if its anomeric carbon (the carbon joined to the ring O) carries a free –OH (hemiacetal), because then the ring opens in solution to give the open-chain –CHO form.

A: β-D-glucopyranose; anomeric C has –OH (hemiacetal) reacts

B: methyl glucopyranoside; anomeric C has -OCH3 (acetal, glycoside) ring cannot open, does not react

C: methyl furanoside; anomeric C has -OCH3 (acetal, glycoside) does not react

D: α-D-galactopyranose; anomeric C has –OH (hemiacetal) reacts

B and C do not react with Tollens' reagent.

Answer: (4)

JEE Main 2026 (Online) 23rd January Morning Shift

Keep practising — Biomolecules

2

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

  1. L-sugar component
  2. D-sugar component
  3. Chiral phosphate unit
  4. Base unit
JEE Main 2026 (Online) 23rd January Evening Shift
3

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are false
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 22nd January Morning Shift
4

Match List-I with List-II. Choose the correct answer from the options given below :

  1. A-IV, B-III, C-II, D-I
  2. A-I, B-III, C-IV, D-II
  3. A-III, B-I, C-IV, D-II
  4. A-IV, B-I, C-II, D-III
JEE Main 2026 (Online) 22nd January Evening Shift
5

Identify the correct statements. Choose the correct answer from the options given below :

  1. C and D Only
  2. A and D Only
  3. C and E Only
  4. B and E Only
JEE Main 2026 (Online) 21st January Morning Shift
6

The correct statements are : Choose the correct answer from the options given below :

  1. A, B and D Only
  2. A, C and D Only
  3. B and C Only
  4. A and B Only
JEE Main 2026 (Online) 21st January Evening Shift
7

[figure] Choose the correct option for structures of A and B, respectively

  1. [figure] and [figure]
  2. [figure] and [figure]
  3. [figure] and [figure]
  4. [figure] and [figure]
JEE Main 2025 (Online) 8th April Evening Shift
8

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below

  1. Both Statement I and Statement II are false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
JEE Main 2025 (Online) 7th April Morning Shift
9

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is incorrect but Statement II is correct
  2. Both Statement I and Statement II are incorrect
  3. Both Statement I and Statement II are correct
  4. Statement I is correct but Statement II is incorrect
JEE Main 2025 (Online) 7th April Evening Shift
10

Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

  1. NH2-CH2-COOH and NH2- CH3 |CH-COOH
  2. NH2-CH2-COCl and NH3- CH3 |CH-COCl
  3. NH2-CH2-COCl and NH2- CH3 |CH-COOH
  4. NH2-CH2-COOH and NH2- CH3 |CH-COCl
JEE Main 2025 (Online) 4th April Morning Shift
11

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is . 5'-G-G-C-A-A-A-T-C-G-G-C-T-A-3'

JEE Main 2025 (Online) 4th April Morning Shift

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