1. Rank the alanes below in order of increasing relative Lewis acidity (1 is most acidic, 4 is least acidic). Provide a brief explanation for your ordering. AlCl3 Al(Et)3 Rank: AICI(Et)2 AlCl2(Et)
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- 2. Give the pK₂ values for the following compounds and then rank them in terms of increasing acidity. Explain why the values change so dramatically (each pKa unit is an order of magnitude) from one member of the series to the next. NH3 HF CH4 H₂ODescribe the trends in the acidityand physical properties of carboxylicacids, and explain how their acidityvaries with their substituents.Pyridine forms a stronger Lewis acid-base complex with SO3 than SO2. However, pyridine forms a weaker complex with SF6 than with SF4. Explain the difference.
- Aniline (conjugate acid pKa 4.63) is a considerably stronger base than diphenylamine (pKa 0.79). Account for these marked differences.3. Which anion is the weakest base? (A) (B) 4. For the structure shown below, which is the least acidic hydrogen? (В) (A) но- (D) -NH3* CO2H (C) 5. Which of the following compounds will be the most reactive toward nucleophilic attach? OCH3 (A) `CI (B) `NH2 (D) (C) 6. What is the product of following reaction sequence? Choose fro answers A, B, and C. NaOCH3 CH3I(Excess) ? Он B19.39 (a) Rank the following compounds in order of increasing acidity. (b) Which compound forms the strongest conjugate base? O₂N. OH A B OH C OH D OH
- The following compound is being tested by Pfizer a drug candidate to treat Covid-19. There are multiple amide bonds in the structure that provide rigidity. There is another carbon that has the same oxidation state as a carboxylic acid derivative. Which carbon is it? F3C -NH HN PF-07321332 Selected Coordinates Clear27(c) Most basic nitrogen A or B? (Hint: The lone pairs on the two play different roles in the aromaticity of the molecule, and consequently one Nitrogen will get protonated before the other)Suppose you have a mixture of these three compounds. Devise a chemical procedure based on their relative acidity or basicity to separate and isolate each in pure form.
- As far back as the 16th century, South American Incas chewed the leaves of the coca bush, Erythroxylon coca, to combat fatigue. Chemical studies of Erythroxylon coca by Friedrich Wöhler in 1862 resulted in the discovery of cocaine, C17H21NO4, as the active component. Basic hydrolysis of cocaine leads to methanol, benzoic acid, and another compound called ecgonine, C9H15NO3. Oxidation of ecgonine with CrO3 yields a keto acid that readily loses CO2 on heating, giving tropinone. (a) What is a likely structure for the keto acid? (b) What is a likely structure for ecgonine, neglecting stereochemistry? (c) What is a likely structure for cocaine, neglecting stereochemistry?The pKa, of the conjugate acid of morpholine is 8.33. (a) Calculate the ratio of morpholine to morpholinium ion in aqueous solution at pH 7.0. (b) At what pH are the concentrations of morpholine and morpholinium ion equal?The gas-phase basicity of triphenylamine (876.4 kJ mol-1) is less thanthat of triphenylphosphine (940.4 kJ mol-1). Write an equation torepresent each reaction. Do you expect electronic or steric factors tocontribute more to this difference? Explain
