Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev

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

Created by: Abhishek Kapoor

JEE : Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev

The document Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE 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 Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev
(ii)  Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev

Solution. (i)

Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev
Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE 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 Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev

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

Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE 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 Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev

Aspartame (Aspartamine)

(i) Four functional groups present in aspartamine are

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

Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev

(ii) Zwitterion structure is given as follows :

Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev
Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev
Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev

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

(iv) Of the  above two amino acids,  Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE 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 Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev

Solution. The structure of two possible dipeptides are

Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev


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

Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE 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 Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev
Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev


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

Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE Notes | EduRev
Subjective Ques of Carbohydrates, Amino Acids, Polymers & Miscellaneous Match the Following, JEE Adv JEE 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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