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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A: Reactants:DieneDienophile
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- 6. Which of the following statements concerning ethanoic acid are correct? (1) It cannot be completely neutralized by sodium hydroxide. (2) Some colourless gas will be given out when it reacts with calcium granules. (3) It is a monobasic acid. (1) and (2) only (1) and (3) only (2) and (3) only D. (1), (2) and (3) 7. Which of the following compounds is a soluble base? А. В. С. Lead(II) oxide Iron(II) sulphate Potassium hydroxide А. В. С. D. Zinc oxide 8. Which of the following pairs of species are conjugate acid-base pairs? А. HІ, NaOH В. Н.РО, РО, С. Н.О", ОН" D. H,SO4, HSO,Treatment of indene with NaNH2 forms its conjugate base in a Brønsted–Lowry acid–base reaction. Draw all reasonable resonance structures forindene's conjugate base, and explain why the pKa of indene is lower thanthe pKa of most hydrocarbons.Dd.22.
- 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?
- Rank the molecules in decreasing (strongest to weakest) acidity. Include resonance structures if necessary and explain reasoning for rank.3. Rationalize the substantial differences in relative rates of alkaline hydrolysis for the following pair of amides: Ph N7 105 > Ph NH₂22. Which of the following is FALSE with regard to acid strength? A) B) C) D) E) HCIO3 > HCIO₂ H₂SO3 > H3PO3 HBr > H₂S H₂O > NH3 HF > HI
- 26. Rank the following compounds in order of increasing water solubility. The first compound in should have the lowest water solubility. OH 3 (a) 1<3<2 (b) 3 <2<1 (c) 2<1<3 (d) 3 <1<2Given the Ka values (in parentheses) for the following acids: HSO4– (Ka= 1.2 x 10–2); HNO2 (Ka= 4.0 x 10–4); HC2H3O2 (Ka= 1.8 x 10–5); Calculate Kc values for the following acid-base equilibria: (a) HSO4–(aq) + C2H3O2–(aq) ⇌ HC2H3O2(aq) + SO42–(aq) (b) HC2H3O2(aq) + NO2–(aq) ⇌ HNO2(aq)+ C2H3O2–(aq)Write the equilibrium-constant expressions and obtainnumerical values for each constant in. (a) the basic dissociation of aniline, C6H5NH2. (b) the acidic dissociation of hypochlorous acid,HClO. (c) the acidic dissociation of methyl ammoniumhydrochloride, CH3NH3Cl. (d) the basic dissociation of NaNO2. (e) the dissociation of H3AsO3to H3O+and AsO33-. (f) the reaction of C2O42-with H2O to give H2C2O4and OH-. show solution