organic chem 2 19. Which of the amino acids (below) exhibit two chiral cemers? c

Question

organic chem 2

19. Which of the amino acids (below) exhibit two chiral cemers? c. threonine d trypophan e. NCR alanine b. tyrosine 21. will exhibit the lowest boiling point? b. Ethy lmethyl amine e. NCR G. Trimethylamine a. n-Propanamine d. n-lsopropylamine 21. The position of the nitro groups in o-dinitrobenzene are i located al carbons a. 1 and 2 b. 1 and 3 e 1 and 4 d. 1 and S e NCR 25. Which of the following amino acids below is the most acidic? d glutamic acid e. NCR to foerm how many different e. NCR a tryptopharn h. aspartic acid 27, Four ditferent amino acids can be combined in different soquences t phtamine etrapeptides? b. 16 c. 24 d. 32 can be used to desect individual amino acids on paper chromatograms Hinsberg Test b. Ninhydrin lest c. Bird Te· d. Bayers Test e. NCR 29.

Explanation / Answer

19. Threonine contains two chiral centers. Rest of the compounds contain single chiral center. Answer is c.

21. Boiling points of amines: 1o > 2o > 3o amine. So, trimethyl amine will have lowest boiling points. Answer is c.

23. o-dinitrobenzene means nitro groups are present on ortho position, which is 2nd position. So, nitro groups are on 1 and 2 groups. Answer is a.

25. The most acidic is aspartic acid and glutamic acid. Answers are b and d.

27. Different amino acids form tetrapeptideswith different sequences. 4 amino acids will form: 4*3*2*1 = 24. Answer is c.

29. Ninhydrin test is used to detect amino acids on paper chromatogram. As the amino acids are colorless. If a blue colour appears with the test solution, then amino acids are present. So, answer is b.

31. All are reducing disaccharide except sucrose. Sucrose does not contain free C which connects glucose and fructose. So, it is not able to reduce metal ion. Answer is a.

33. All the compounds produce glucose on hydrolysis. So, answer is e.

35.The common name of octanoic acid is caprylic acid. Answer is a.

37. The lipids contain -COOR functional group. lipids are mostly formed by esterification of alcohol and carboxylic acid.The answer is d.

39. o-nitro benzoic acid has the lowest pKa value because it is the strongest acid. The NO2 group is electron withdrawing group, and attract electrons from the O-H of carboxylic group. The bond becomes weak and thus it becomes stronger acid. Answer is b.

41. Methionine contains S, as the name also has thio word. So, answer is b.

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