Q: Match List-I with List-II.

Glucose is a carbohydrate. Insulin is a protein and a hormone.DNA is neither carbohydrate nor protein. H2NCH2CH2COOH is neither carbohydrate nor protein.

Question 1

Amylopectin is composed of:

Accepted Answer

Solution:- (A)  \alpha-D- glucose,  C_1-C_4  and  C_1-C_6  linkagesAmylopectin is a homoplymer of  \alpha -D- glucose where  C_1-C_4  linkage and  C_1 - C_6  linkage are present.

Question 2

Aspartame, an artificial sweetener, is a peptide and has the given structure. Which of the following is correct about the molecule?

Accepted Answer

Aspartame contains two amino acids joined together by a peptide bond. Therefore, on hydrolysis, aspartame will produce a mixture of 2 amino acids. It has four functional groups (ester, carboxylate, amine and amide).

Question 3

Which of the following molecules is capable of forming zwitter ion?

Accepted Answer

\mathrm{N}\mathrm{H}_{2}\mathrm{C}\mathrm{H}_{2}\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}   is capable of forming zwitter ion. Carboxylic and amino groups of amino acids do not exist as such but they react with each other to form internal salt structure which is called zwitter ion structure.Zwitter ion is the dipolar form of an amino acid which occurs when  H^{+}  ion is transferred from an acid group to an amine group. It is a neutral molecule with a positive and a negative electrical charge, though multiple positive and negative charges can be present. Zwitter ions are distinct from dipoles, at different locations within that molecule.

Question 4

Account for the acidity of L-ascorbic acid ( p{K}_{a}=4.21 ). Which of the following is most acidic  H ? (Marked in the structures as  {H}^{a}, {H}^{b}, {H}^{c}  and  {H}^{d} )

Accepted Answer

The anion formed by the removal of enolic  H  is stable because the negative charge is stabilized by resonance, i.e., by delocalisation of the negative charge to the  O  of the  (C=O)  through  (C=C) .Hence, option C is correct.

Question 5

Match List-I with List-II.

Accepted Answer

Glucose is a&#10;carbohydrate. Insulin is a&#10;protein and a hormone.DNA&#10;is neither carbohydrate nor protein.&#10;&#10;&#10;&#10;&#10;&#10;H2NCH2CH2COOH is neither carbohydrate nor protein.

Question 6

Number of optical isomers of glucose is:

Accepted Answer

Number of optical isomers of glucose is 16.Glucose contains 4 chiral C atoms.Hence, the number of optical isomers is  \displaystyle 2^n = 2^4 = 16  .

Question 7

The carbohydrates are classified on the basis of:

Accepted Answer

The correct statements are I, II and IV only.The carbohydrates are classified on the basis of:I. Sugars and Non sugars : Sugars are crystalline, sweet to taste and water soluble. Non sugars are amorphous, tasteless and water insoluble.II. Reducing character : Reducing carbohydrates and non reducing carbohydrates.IV. Hydrolysis : monosaccharides, disaccharides, oligosaccharides and polysaccharides.The carbohydrates are not classified on the basis of optical activity.Option A, B and D are correct.

Biomolecules