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Biomolecules question

2024 · 4 Apr · Shift 2 · Q2
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Biomolecules question

2024 · 4 Apr · Shift 2 · Q2

JEE MainChemistryBiomoleculesMCQ+4 / −1

Match List I with List II

LIST I LIST II
A. α\alphaα- Glucose and α\alphaα - Galactose I. Functional isomers
B.
α - Glucose and β - Glucose \alpha \text { - Glucose and } \beta \text { - Glucose }α - Glucose and β - Glucose 
 II. Homologous
C.
α - Glucose and α - Fructose \alpha \text { - Glucose and } \alpha \text { - Fructose }α - Glucose and α - Fructose 
 III. Anomers
D.
α - Glucose and α - Ribose \alpha \text { - Glucose and } \alpha \text { - Ribose }α - Glucose and α - Ribose 
 IV. Epimers

Choose the correct answer from the options given below:

  1. A
    A-III, B-IV, C-II, D-I
  2. B
    A-IV, B-III, C-I, D-II
  3. C
    A-III, B-IV, C-I, D-II
  4. D
    A-IV, B-III, C-II, D-I
View written solutionFree

Correct answer: B

  1. Identify each pair in List I

We match the carbohydrate pairs with the correct relationship.

  1. Pair A: α\alphaα-Glucose and α\alphaα-Galactose

Glucose and galactose differ in configuration at only one chiral carbon (at C4C_4C4​).

Such sugars are called epimers.

So, A→IVA \to IVA→IV

  1. Pair B: α\alphaα-Glucose and β\betaβ-Glucose

These differ only in configuration at the anomeric carbon (C1C_1C1​ in glucose).

Such a pair is called anomers.

So, B→IIIB \to IIIB→III

  1. Pair C: α\alphaα-Glucose and α\alphaα-Fructose

Glucose is an aldohexose and fructose is a ketohexose.

They have the same molecular formula C6H12O6C_6H_{12}O_6C6​H12​O6​ but different functional groups.

Hence they are functional isomers.

So, C→IC \to IC→I

  1. Pair D: α\alphaα-Glucose and α\alphaα-Ribose

Glucose is a hexose and ribose is a pentose. They differ by one carbon unit in the chain length, so they are treated here as homologous.

So, D→IID \to IID→II

  1. Final matching

Thus, A−IV,B−III,C−I,D−IIA-IV,\quad B-III,\quad C-I,\quad D-IIA−IV,B−III,C−I,D−II

This corresponds to Option B.

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