Homework Answers
Question 24
Answer : option A. I>III>II
Acidity of alcohol is due to polar nature of OH bond. Presence of electron withdrawing groups will increase the polarity of OH bond.because the electron withdrawing groups will decrease the electron density on oxygen atom of OH bond, which leads to increased acidic strength.
NO2 and CN groups are electron withdrawing groups.so the presence of these groups will increase the acidity of alcohols.
Comparing NO2 and CN groups, NO2 have more electrom withdrawing ability than CN. Because nitrogen is more electro negative than carbon.
So compound I is most acidic, then comes compound III and compound II is least acidic.
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QUESTION 24 Rank the following alcohols in decreasing order of acidity. ROH ON OH ОН NC...
II Indicate the number of signals in 'H NMR and 3C NMR of the following compounds....
II Indicate the number of signals in 'H NMR and 3C NMR of the following compounds. And mark the multiplicity on each proton directly not in the table (s- singlet, d-doublet, t-triplet, q-quartet, p-pentet, h-hextet, m-multiplet....) a. b. d. CI Cl CI Ci a. b. C. d. H NMR signals 13C NMR
Question 12 Rank the indicated protons in decreasing order of acidity. = I III H O...
Question 12 Rank the indicated protons in decreasing order of acidity. = I III H O I>III>II II>III>I I>II>III II>I>III III>II>I
Question 33 The correct structure for ethyl 2-chloropentanoyl chloride is: o OH CI CI ОН OH...
Question 33 The correct structure for ethyl 2-chloropentanoyl chloride is: o OH CI CI ОН OH I II III "CI CI CI IV V A. II B. I C. IV D.V E. III Question 34 A compound with the molecular formula Cg4 gBro gave the following H NMR spectrum: triplet, 5 1.4 quartet, 8 3.9 multiplet, 5 7.0 (4H) There was no evidence of an -OH band in the IR spectrum. A possible structure for the compound is: Br Br...
II. NMR Spectroscopy. Show your work with some brief notes/explanations and any calculations as needed. 1....
II. NMR Spectroscopy. Show your work with some brief notes/explanations and any calculations as needed. 1. The expected 'H NMR spectrum of the following compound is expected to have signals with multiplicities A. three; two doublets and a triplet C.four, two singlets, a double and a triplet E. None of these B.three; a singlet, a doublet and a quartet D.four, two singlets and two triplets 2. Which of the following is the best prediction of the chemical shifts for the...
15. Rank the following acids in decreasing (strongest to weakest) order of acidity. b. II> I>III...
15. Rank the following acids in decreasing (strongest to weakest) order of acidity. b. II> I>III > V> IV c. IV> III> I II >V ?. IV > V > 111 > 1 > 11 Answer: 6. Prov conversion. vide the reagents necessary to carry out the tollowing a. 1. Mg/ether ?. ??? 3. H30* b. 1. NaOH 2. KMn04/NaOH/H20 3. H30* ?. 1. NaCN 2. H30+, heat afi of these Answer:
Question 11 (2 points) Rank absorption of the indicated bonds in decreasing (highest to lowest) order...
Question 11 (2 points) Rank absorption of the indicated bonds in decreasing (highest to lowest) order of IR frequency H II Oa) III>II>I ob) >I>III Oc) III>I>11 od) 1>II>III Question 12 (2 points) Which of the indicated protons in the following compound would appear most downfield in the 'H NMR spectrum? IV Oa) IV ob) 11 Oc) od) III
Considering only the highlighted hydrogens, list the following compounds in order of decreasing acidity: 1 II...
Considering only the highlighted hydrogens, list the following compounds in order of decreasing acidity: 1 II TV A. IV, V, II, I, III B. III, V, IV, 1, 11 C. III, I, II, V, IV D.V, IV, III, II, 1 E. I, II, III, IV, V
18) How many signals would you expect to see in the 1H NMR spectrum of the...
18) How many signals would you expect to see in the 1H NMR spectrum of the following compound? 18) NI CH3CH2CH2CCH3 A) 6 B) 4 C)2 D) 5 E) 3 3 19) What splitting pattern is observed in the 1H NMR spectrum for the indicated hydrogens? OCH CH3 19) - D) quartet E) septet A) singlet B) doublet C) triplet 20) Which of the following alcohols dehydrates most rapidly? 1 -OH IV. CH3- 20) CH3- II. CH3 OH Cox HO...
50. For the following compound how many different signals would you see in the proton NMR?...
50. For the following compound how many different signals would you see in the proton NMR? (Assume that you can see them all.) A) 4 B) 5 C) 6 D) 7 E) 8 . An organic compound absorbs strongly in the IR at 1687 em. Its 'H NMR spectrum consists of two signals, a singlet at 2.1 ppm and a multiplet centered at 7.1 ppm. Its mass spectrum shows significant peaks at m/z 120, m/z 105 and m/z 77. This...
Question 31 9 pts Rank the following molecules based on their acidity (greatest = most acidic;...
Question 31 9 pts Rank the following molecules based on their acidity (greatest = most acidic; least = least acidic). H N I. H + II. NH3 III. OT> || > III I > III > Il III > II > None of the answer choices provided are correct. II > III > 1
II Indicate the number of signals in 'H NMR and 3C NMR of the following compounds. And mark the multiplicity on each proton directly not in the table (s- singlet, d-doublet, t-triplet, q-quartet, p-pentet, h-hextet, m-multiplet....) a. b. d. CI Cl CI Ci a. b. C. d. H NMR signals 13C NMR
Question 12 Rank the indicated protons in decreasing order of acidity. = I III H O I>III>II II>III>I I>II>III II>I>III III>II>I
Question 33 The correct structure for ethyl 2-chloropentanoyl chloride is: o OH CI CI ОН OH I II III "CI CI CI IV V A. II B. I C. IV D.V E. III Question 34 A compound with the molecular formula Cg4 gBro gave the following H NMR spectrum: triplet, 5 1.4 quartet, 8 3.9 multiplet, 5 7.0 (4H) There was no evidence of an -OH band in the IR spectrum. A possible structure for the compound is: Br Br...
II. NMR Spectroscopy. Show your work with some brief notes/explanations and any calculations as needed. 1. The expected 'H NMR spectrum of the following compound is expected to have signals with multiplicities A. three; two doublets and a triplet C.four, two singlets, a double and a triplet E. None of these B.three; a singlet, a doublet and a quartet D.four, two singlets and two triplets 2. Which of the following is the best prediction of the chemical shifts for the...
15. Rank the following acids in decreasing (strongest to weakest) order of acidity. b. II> I>III > V> IV c. IV> III> I II >V ?. IV > V > 111 > 1 > 11 Answer: 6. Prov conversion. vide the reagents necessary to carry out the tollowing a. 1. Mg/ether ?. ??? 3. H30* b. 1. NaOH 2. KMn04/NaOH/H20 3. H30* ?. 1. NaCN 2. H30+, heat afi of these Answer:
Question 11 (2 points) Rank absorption of the indicated bonds in decreasing (highest to lowest) order of IR frequency H II Oa) III>II>I ob) >I>III Oc) III>I>11 od) 1>II>III Question 12 (2 points) Which of the indicated protons in the following compound would appear most downfield in the 'H NMR spectrum? IV Oa) IV ob) 11 Oc) od) III
Considering only the highlighted hydrogens, list the following compounds in order of decreasing acidity: 1 II TV A. IV, V, II, I, III B. III, V, IV, 1, 11 C. III, I, II, V, IV D.V, IV, III, II, 1 E. I, II, III, IV, V
18) How many signals would you expect to see in the 1H NMR spectrum of the following compound? 18) NI CH3CH2CH2CCH3 A) 6 B) 4 C)2 D) 5 E) 3 3 19) What splitting pattern is observed in the 1H NMR spectrum for the indicated hydrogens? OCH CH3 19) - D) quartet E) septet A) singlet B) doublet C) triplet 20) Which of the following alcohols dehydrates most rapidly? 1 -OH IV. CH3- 20) CH3- II. CH3 OH Cox HO...
50. For the following compound how many different signals would you see in the proton NMR? (Assume that you can see them all.) A) 4 B) 5 C) 6 D) 7 E) 8 . An organic compound absorbs strongly in the IR at 1687 em. Its 'H NMR spectrum consists of two signals, a singlet at 2.1 ppm and a multiplet centered at 7.1 ppm. Its mass spectrum shows significant peaks at m/z 120, m/z 105 and m/z 77. This...
Question 31 9 pts Rank the following molecules based on their acidity (greatest = most acidic; least = least acidic). H N I. H + II. NH3 III. OT> || > III I > III > Il III > II > None of the answer choices provided are correct. II > III > 1
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