Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

JEE: Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

The document Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE is a part of the JEE Course Chemistry 35 Years JEE Main & Advanced Past year Papers.
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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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE
(ii)  Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

Solution. (i)

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE


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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

(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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

(ii) Zwitterion structure is given as follows :

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

Solution. The structure of two possible dipeptides are

Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE


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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

(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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEESubjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE


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 | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE
Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE

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.

The document Subjective Type Questions: Carbohydrates, Amino Acids, Polymers & Miscellaneous | JEE Advanced Notes | Study Chemistry 35 Years JEE Main & Advanced Past year Papers - JEE is a part of the JEE Course Chemistry 35 Years JEE Main & Advanced Past year Papers.
All you need of JEE at this link: JEE

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