Prob 6. Complete the following reaction:
Prob 7. In the structure of aspartame (an artificial sweetner) which is a peptide
i) Identify the four functional groups
(ii) Write the zwitterionic structure
(iii) Write the structure of amino acids obtained from the hydrolysis of aspartame
Sol. (i) Four functional groups in aspartame are
– NH2 (amino group)
– COOH (carboxyl group)
(iii) Hydrolysis of aspartame gives following two amino acids
Prob 8. Following two amino acids lysine and glutamine form dipeptide linkage. What are two possible dipeptide?
Prob 9. Complete the following reactions
Prob 11. Give the classification of polymers obtained from esters of acrylic acid (CH2 = CH.COOH)
Formula of monomer
|Hard transparent, high optical clarity. It is capable of acquiring different colours and tints||Lenses, transparent object domes and skylights plastic jewellery|
|Tough and rubbery polymer||Similar to above|
|Hard, horney and high melting material||Used in preparing cloth, carpets and blankets|
Prob 12. When primary bromides are treated with a solution of NaI in pure acetone precipitate generates within 3 minutes at 25°C whereas primary chlorides when treated with same reagent precipitate generates within 6 minutes at 50°C. Explain.
Sol.The reaction is probably of the SN2 type involving a bimolecular attack of the iodide ion upon the carbon atom carrying the chloride or bromine. Now Br– is better leaving group when Cl– (as it is a weaker base). So the rate of the reaction for bromides is faster.
RBr + NaI -> RI + NaBr|
RCl + NaI -> RI + NaCl|
Prob 13. Glucose and fructose give the same osazone? Explain
Sol. During osazone formation reaction occurs only at C1and C2 while rest of the molecule remains same, and glucose & fructose differ from each other only in arrangement of atoms at C1 and C2, so they give same osazone
Prob 14. Specific rotations of α-anomer of given mono saccharide is + 112o and for β-anomer is + 19o. Specific rotation of equilibrium mixture is 52.7o calculate % composition of α and β anomers in the equilibrium mixture.
Sol. Suppose fraction of andanomers is X and Y respectively
X + Y = 1 ……………………..(1)
112X + 19Y = 52.7……………(2)
By solving above two equations
X = 36.2%, Y = 63.8%
Prob 15. Predict the products of the treatment of glycine with
(a) Aqueous NaOH
(b) Aqueous HCl
(c) Acetic anhydride
(d) NaNO2 + HCl
Sol. (a) H2N.CH2COO–Na+
(b) Cl– + H3NÅCH2COOH
(d) HOCH2COOH + N2
|« Click Here for Previous Topic||Click Here for Next Topic »|
To get fastest exam alerts and government job alerts in India, join our Telegram channel.