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If this problem is graded:50 Problem #10. Furan and thiophene are...
a) The aromatic heterocycle, thiophene, reacts with bromine. Present the mechanism and the structure of the product. b) What problem is present with the reaction between both pyrrole and furan with b...
a) The aromatic heterocycle, thiophene, reacts with bromine.
Present the mechanism and the structure of the product.
b) What problem is present with the reaction between both
pyrrole and furan with bromine?
c) The starting material reacts with H2SO4 affording
intermediate X which undergoes asylation. Present the mechanism for
the asylation. Which is the final product (I or II)? Why?
Br2 OH H SO, 0 OH OH OH OH starting material intermediate X product I product lI
Br2
OH H...
9, Which of the intermediates shown is present in the sigma complex formed from the nitration of anisole? OCH оCH O...
9, Which of the intermediates shown is present in the sigma complex formed from the nitration of anisole? OCH оCH OCH OCH NO2 NO2 NO2 NO2 IV III A III B. IV C I D. II E. None 10. What product is formed from the reaction shown below?" I. NaOCH 2.H/0 NO осн, OCH OCH оснь OCH oCH NO NO NO IV II A B IV C. I D. I E. None 11. Draw Frost circle diagrams for each compound...
help please 9. Which of the intermediates shown is present in the sigma complex formed from...
help please
9. Which of the intermediates shown is present in the sigma complex formed from the nitration of anisoler OCH A. II B. IV с. І D. III E. None 10. What product is formed from the reaction shown below? 1. NaOCH 2. Hy B. 1 C. IV D. III E. None Section B: Free Response (you must show your work for full credit) II. Draw Frost circle diagrams for each compound shown. Assume that all hybridized. Populate the...
CHM 250 for 10 c)Cyclopentadiene is much more acidic than cycloheptatriene. (Ka cyclopentadiene, Ka 103% for...
CHM 250 for 10 c)Cyclopentadiene is much more acidic than cycloheptatriene. (Ka cyclopentadiene, Ka 103% for cycloheptatriene.) explain why? H 3 points H H H H H H H H H H H T T 2) Draw the Molecular Orbital diagrams (Frost circle) of Benzene and cyclobutadiene in the ground state. Specify whether the molecule is aromatic/antiaromatic a) Benzene aromatic/antiaromatic (4+1) aromatic/antiaromatic (4+1) b) Cyclobutadiene 13 (2 1. O3 2. Zn/H20 -Эн -Эн H I A) I and II B)...
Please help me understand the correct answers by stating the correct answers and why it is correct. 31. Which of the fo...
Please help me understand the correct answers by stating the
correct answers and why it is correct.
31. Which of the following are converted to an aromatic species by the loss of a hydride ion? IV III Il, IV A. , IV B. C. I,Il D. , IlI 32. On reaction with acid, 4-pyrone is protonated to give a very stable cationic product. Which of the following structures shows the protonation site in that product? H e) d) b) a)...
Please answer Questions 8,9, & 10 and explain why please. Thanks! 8. Which compound is the...
Please answer Questions 8,9,
& 10 and explain why please. Thanks!
8. Which compound is the reactant for this reaction? OH ? 1. NaOH (excess), 70°C 2. H30* NO2 H NO2 NO2 B. NO2 NO2 D Br NO2 E. A. C. 9. Which statement best describes the aromaticity and UV-vis spectra of these two substances? II A. Both are aromatic. The longest wavelength of absorbance of I is larger than that of II. B. Both are aromatic. The longest wavelength...
26,30.Explain why. 31,32. Explain why. 26. What is the IUPAC name of the following compound? A...
26,30.Explain why.
31,32. Explain why.
26. What is the IUPAC name of the following compound? A 2-Nitro-5-carboxychlorobenzene B. 2-Chloro-4-carboxynitrobenzene 099 2-Chloro-1-nitro-4-benzoic acid D. 3-Chloro-4-nitrobenzoic acid 27. What is the correct structure for para-bromotoluene? Be Meo BE Br Br WI B II C. IL DIV 28. Why is the following compound not aromatic? A It has 4n -electrons. It is not cyclic C. It has 4n+ 2 -electrons D. The p electron orbitals are not continuous 29. What is the hybridization...
11) (50 pts total) Consider the following 2 compounds: Yor You I II (a) (6 pts)...
11) (50 pts total) Consider the following 2 compounds: Yor You I II (a) (6 pts) Provide the IUPAC names for compounds I and II. Compound I: Compound II: (b) (10 pts) Draw the resonance contributors of compounds I and II. Which compound is more stable? Explain in 20 words or less. (c) (6 pts) Which C-N bond below is shorter, A or B ? Explain in 20 words or less. (d) (6 pts) Draw the products obtained when compound...
10. What is a major problem with Friedel-Crafts alkylation? A) It requires high temperatures. B) The...
10. What is a major problem with Friedel-Crafts alkylation? A) It requires high temperatures. B) The conditions are too acidic. C) The starting material is frequently over-alkylated. D) The products coordinate with the aluminum chloride. 11. Which of the following statements about the mechanism of electrophilic aromatic substitution is not true? A) All electrophilic aromatic substitution reactions occur via a two-step mechanism. B) The transition state of the first step is lower in energy. C) The first step is the...
Can you please answer all of them? Section B: Free Response (you must show your work...
Can you please answer all of them?
Section B: Free Response (you must show your work for full credit) 1. Draw Frost circle diagrams for each compound shown. Assume that all atoms in the ring are sp2 hybridized. Populate the pi electrons in the corresponding MO's. Identify the compound as aromatic or antiaromatic. (5 pts) 2. What is the Hückel number of pi electrons for the molecule shown below? How many pi electron pairs does it have? Would you expect...
a) The aromatic heterocycle, thiophene, reacts with bromine.
Present the mechanism and the structure of the product.
b) What problem is present with the reaction between both
pyrrole and furan with bromine?
c) The starting material reacts with H2SO4 affording
intermediate X which undergoes asylation. Present the mechanism for
the asylation. Which is the final product (I or II)? Why?
Br2 OH H SO, 0 OH OH OH OH starting material intermediate X product I product lI
Br2
OH H...
9, Which of the intermediates shown is present in the sigma complex formed from the nitration of anisole? OCH оCH OCH OCH NO2 NO2 NO2 NO2 IV III A III B. IV C I D. II E. None 10. What product is formed from the reaction shown below?" I. NaOCH 2.H/0 NO осн, OCH OCH оснь OCH oCH NO NO NO IV II A B IV C. I D. I E. None 11. Draw Frost circle diagrams for each compound...
help please
9. Which of the intermediates shown is present in the sigma complex formed from the nitration of anisoler OCH A. II B. IV с. І D. III E. None 10. What product is formed from the reaction shown below? 1. NaOCH 2. Hy B. 1 C. IV D. III E. None Section B: Free Response (you must show your work for full credit) II. Draw Frost circle diagrams for each compound shown. Assume that all hybridized. Populate the...
CHM 250 for 10 c)Cyclopentadiene is much more acidic than cycloheptatriene. (Ka cyclopentadiene, Ka 103% for cycloheptatriene.) explain why? H 3 points H H H H H H H H H H H T T 2) Draw the Molecular Orbital diagrams (Frost circle) of Benzene and cyclobutadiene in the ground state. Specify whether the molecule is aromatic/antiaromatic a) Benzene aromatic/antiaromatic (4+1) aromatic/antiaromatic (4+1) b) Cyclobutadiene 13 (2 1. O3 2. Zn/H20 -Эн -Эн H I A) I and II B)...
Please help me understand the correct answers by stating the
correct answers and why it is correct.
31. Which of the following are converted to an aromatic species by the loss of a hydride ion? IV III Il, IV A. , IV B. C. I,Il D. , IlI 32. On reaction with acid, 4-pyrone is protonated to give a very stable cationic product. Which of the following structures shows the protonation site in that product? H e) d) b) a)...
Please answer Questions 8,9,
& 10 and explain why please. Thanks!
8. Which compound is the reactant for this reaction? OH ? 1. NaOH (excess), 70°C 2. H30* NO2 H NO2 NO2 B. NO2 NO2 D Br NO2 E. A. C. 9. Which statement best describes the aromaticity and UV-vis spectra of these two substances? II A. Both are aromatic. The longest wavelength of absorbance of I is larger than that of II. B. Both are aromatic. The longest wavelength...
26,30.Explain why.
31,32. Explain why.
26. What is the IUPAC name of the following compound? A 2-Nitro-5-carboxychlorobenzene B. 2-Chloro-4-carboxynitrobenzene 099 2-Chloro-1-nitro-4-benzoic acid D. 3-Chloro-4-nitrobenzoic acid 27. What is the correct structure for para-bromotoluene? Be Meo BE Br Br WI B II C. IL DIV 28. Why is the following compound not aromatic? A It has 4n -electrons. It is not cyclic C. It has 4n+ 2 -electrons D. The p electron orbitals are not continuous 29. What is the hybridization...
11) (50 pts total) Consider the following 2 compounds: Yor You I II (a) (6 pts) Provide the IUPAC names for compounds I and II. Compound I: Compound II: (b) (10 pts) Draw the resonance contributors of compounds I and II. Which compound is more stable? Explain in 20 words or less. (c) (6 pts) Which C-N bond below is shorter, A or B ? Explain in 20 words or less. (d) (6 pts) Draw the products obtained when compound...
10. What is a major problem with Friedel-Crafts alkylation? A) It requires high temperatures. B) The conditions are too acidic. C) The starting material is frequently over-alkylated. D) The products coordinate with the aluminum chloride. 11. Which of the following statements about the mechanism of electrophilic aromatic substitution is not true? A) All electrophilic aromatic substitution reactions occur via a two-step mechanism. B) The transition state of the first step is lower in energy. C) The first step is the...
Can you please answer all of them?
Section B: Free Response (you must show your work for full credit) 1. Draw Frost circle diagrams for each compound shown. Assume that all atoms in the ring are sp2 hybridized. Populate the pi electrons in the corresponding MO's. Identify the compound as aromatic or antiaromatic. (5 pts) 2. What is the Hückel number of pi electrons for the molecule shown below? How many pi electron pairs does it have? Would you expect...
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