Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper

JEE : Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

The document Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev is a part of the JEE Course Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper.
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Q.1. Give the structures of the products in each of the following reactions.    (2000 - 4 Marks)

(i) Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev
(ii)  Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

Solution. (i)

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev


Q.2. Write the structures of alanine at pH = 2 and pH = 10.      (2000 - 2 Marks)

Solution. TIPS/Formulae :

pH = 2 indicates acidic character whereas pH = 10 indicates basic character.

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

Q.3. Aspartame, an artificial sweetener, is a peptide and has the following structure :  (2001 - 5 Marks)

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

(i) Identify the four functional groups.
 (ii) Write the zwitterionic structure.
 (iii) Write the structures of the amino acids obtained from the hydrolysis of aspartame.
 (iv) Which of the two amino acids is more hydrophobic?

Ans. (i) Amine, Carboxylic acid, Amide, Ester

[For answers of rest of the questions refer solutions]

Solution. 

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

Aspartame (Aspartamine)

(i) Four functional groups present in aspartamine are

(a) –NH2 (Amine)
(b) –COOH (Carboxylic acid)

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

(ii) Zwitterion structure is given as follows :

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

Hence on hydrolysis two amino acids (a) and (b) are obtained

(iv) Of the  above two amino acids,  Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

is more hydrophobic due to presence of non-polar and bulky benzyl group.


Q.4. Followin g two amino acids lysine and glutamine form dipeptide linkage. What are two possible dipeptides?   (2003 - 2 Marks)

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

Solution. The structure of two possible dipeptides are

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev


Q.5. The Fisher projection of D-glucose is drawn below.    (2004 - 2 Marks)

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

(i) Draw the Fisher projection of L-glucose.
 (ii) Give the reaction of L-glucose with Tollen’s reagent

Solution. L-Glucose is an enantiomer of D-glucose, hence

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRevSubjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev


Q.6. Which of the following will reduce Tollen’s reagent? Explain.    (2005 - 2 Marks)

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | EduRev

Solution. In the two disaccharides structure A will be reducing sugar since both monosaccharides units are not linked through their reducing centers, while in structure B both the monosaccharide units are linked through their reducing centers, hence it will be non-reducing.

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