Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 20.SE, Problem 64AP
The following pKa values have been measured. Explain why a hydroxyl group in the para position decreases the acidity while a hydroxyl group in the meta position increases the acidity.
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Chapter 20 Solutions
Organic Chemistry
Ch. 20.1 - Give IUPAC names for the following compounds:Ch. 20.1 - Draw structures corresponding to the following...Ch. 20.2 - Prob. 3PCh. 20.2 - The Ka for dichloroacetic acid is 3.32 Ă— 10-2....Ch. 20.3 - Calculate the percentages of dissociated and...Ch. 20.4 - Which would you expect to be a stronger acid, the...Ch. 20.4 - Dicarboxylic acids have two dissociation...Ch. 20.4 - The pKa of p-cyclopropylbenzoic acid is 4.45. Is...Ch. 20.4 - Prob. 9PCh. 20.5 - Prob. 10P
Ch. 20.6 - Prob. 11PCh. 20.6 - How might you carry out the following...Ch. 20.7 - Prob. 13PCh. 20.7 - Prob. 14PCh. 20.8 - Cyclopentanecarboxylic acid and...Ch. 20.8 - Prob. 16PCh. 20.SE - Prob. 17VCCh. 20.SE - Prob. 18VCCh. 20.SE - The following carboxylic acid can’t be prepared...Ch. 20.SE - Electrostatic potential maps of anisole and...Ch. 20.SE - Predict the product(s) and provide the mechanism...Ch. 20.SE - Predict the product(s) and provide the mechanism...Ch. 20.SE - Prob. 23MPCh. 20.SE - Predict the product(s) and provide the complete...Ch. 20.SE - Acid-catalyzed hydrolysis of a nitrile to give a...Ch. 20.SE - Prob. 26MPCh. 20.SE - Naturally occurring compounds called cyanogenic...Ch. 20.SE - 2-Bromo-6, 6-dimethylcyclohexanone gives 2,...Ch. 20.SE - Naturally occurring compounds called terpenoids,...Ch. 20.SE - In the Ritter reaction, an alkene reacts with a...Ch. 20.SE - Give IUPAC names for the following compounds:Ch. 20.SE - Prob. 32APCh. 20.SE - Prob. 33APCh. 20.SE - Prob. 34APCh. 20.SE - Prob. 35APCh. 20.SE - Prob. 36APCh. 20.SE - Prob. 37APCh. 20.SE - Prob. 38APCh. 20.SE - Calculate the Ka's for the following acids: (a)...Ch. 20.SE - Thioglycolic acid, HSCH2CO2H, a substance used in...Ch. 20.SE - Prob. 41APCh. 20.SE - Prob. 42APCh. 20.SE - How could you convert butanoic acid into the...Ch. 20.SE - How could you convert each of the following...Ch. 20.SE - How could you convert butanenitrile into the...Ch. 20.SE - How would you prepare the following compounds from...Ch. 20.SE - Prob. 47APCh. 20.SE - Using 13CO2 as your only source of labeled carbon,...Ch. 20.SE - Prob. 49APCh. 20.SE - Which method-Grignard carboxylation or nitrile...Ch. 20.SE - Prob. 51APCh. 20.SE - Prob. 52APCh. 20.SE - Propose a structure for a compound C6H12O2 that...Ch. 20.SE - Prob. 54APCh. 20.SE - How would you use NMR (either 13C or 1H) to...Ch. 20.SE - Prob. 56APCh. 20.SE - A chemist in need of 2,2-dimethylpentanoic acid...Ch. 20.SE - Prob. 58APCh. 20.SE - Prob. 59APCh. 20.SE - Prob. 60APCh. 20.SE - Prob. 61APCh. 20.SE - Prob. 62APCh. 20.SE - Prob. 63APCh. 20.SE - The following pKa values have been measured....Ch. 20.SE - Identify the missing reagents a-f in the following...Ch. 20.SE - Propose a structure for a compound, C4H7N, that...Ch. 20.SE - Prob. 67APCh. 20.SE - The 1H and 13C NMR spectra below belong to a...Ch. 20.SE - Propose structures for carboxylic acids that show...Ch. 20.SE - Carboxylic acids having a second carbonyl group...
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- Put the following compounds in order from weakest acid to strongest acid. Explain (pKa values are not enough and trends should be considered).arrow_forwardRank the following compounds in order of increasing acidity (1 = least acidic, 3 = most acidic) and in the space provided use resonance (of the conjugate base) to explain why the compound you have labelled “3” is the most acidic.arrow_forwardIdentify the most and the least acidic compound in each of the following sets. Leave the remaining answer in each set blank. a) 2,4-dinitrobenzoic acid: v p-nitrobenzoic acid: p-bromobenzoic acid: b) benzoic acid: v formic acid: v propanoic acid: c) cyclohexanol: v phenol: v benzoic acid:arrow_forward
- Using pKa Values to Determine Relative Acidity and Basicity Rank the following compounds in order of increasing acidity, and then rank their conjugate bases in order of increasing basicity.arrow_forward1. Rank the following species in order of increasing acidity. Explain your reasons for ordering them as you do. HF NH3 H2SO4 CH3OH CH3COOH H3O+ H2O2. Consider the following compounds that vary from nearly nonacidic to strongly acidic. Draw the conjugate bases of these compounds, and explain why the acidity increases so dramatically with substitution by nitro groups. CH4 CH3NO2 CH2(NO2)2 CH(NO2)3arrow_forwardsolvent such as hydrocarbon, neither accept nor donate protons.arrow_forward
- 6) Assign a given pka to the following compounds. CF3 F₂C OH → он NH₂ H₂Se CF₂ 7) In class we talked about the concept of pKH, which is the pK₂ of the protonated version of the noted molecule. Assign a given pkan to the following molecules. Two of the molecules are so similar it would hard to predict their relative pKan values from structure alone. 9) Circle the most acidic species below. OH NH₂ 8] Circle the weakest base from along the compounds below. H₂S ново F₂C OH O NH pk₂ 5.4 9.3 12.9 15.9 H₂O РКан -10 9.2 10.7 10.8arrow_forwardpKa of CF3CH2OH is higher than the pKa of a CCl3CO2H. Provide the reason Group of answer choices a) The conjugate base of CCl3CO2H is more stabilized than the conjugate base of CF3CH2OH b) The conjugate base of CCl3COH is stabilized by type of atom c) CF3CH2OH is stronger acid d) The conjugate base of CCl3CO2H is less stabilized than the conjugate base of CF3CH2OH e) Fluorine is more electronegative than Clarrow_forwardExplain why p-nitrophenol (the left molecule) is more acidic than p-methylphenol (the right molecule). OH OH OH NO₂ CH3 pk = 7.14 pk = 9.95 = 10.19 a pkaarrow_forward
- Which of the following has the lowest pka value? Hint: a methyl group is an electron donating group which can destabilize the negative charge of the conjugate base. * I CH,COOH I HCOOH 1 (CH),CH – COOH II CH,CH,COH IVarrow_forwardBr NH₂ OH NH₂ CH3 A/RO/exception Circle the more acidic compound and determine the effect responsible for such observation using ARIO methods, or if its an exception to the rule. Please explain thanks.arrow_forwardHow is nucleophilicity (nucleophile strength) related to basicity?arrow_forward
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