;; Which of the following carboxylic acid containing molecules has the largest pKa value? CI CI CI CO2H .CO2H .CO2H CI CO2H .CO2H CI CI CI' CI (d) (a) (b) (c) (e)
Q: Explain why aniline (on the left; pK, = 9.13) is a stronger base than cyclohexylamine (on the right;…
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Q: What are the pKa’sof HCN (hydrocyanic acid), and HF (hydrofluoric acid)? Based only on those…
A: Pka of HCN is 9.2 Pka of HF is 3.2 From this data we can say that HF is more acidic than HCN. This…
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Q: To prepare butanoic acid from 1-propanol, which sequence of reagent(s) is/are best employed? A (1)…
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Q: 4. Calculate the ratio of the concentrations of a thiolate (A) and its corresponding thiol (HA) at a…
A: a) Given : pH of solution of HA = 5.5 And pKa of HA = 10.3 => Ka = 10-pKa = 10-10.3 = 5.012 X…
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Q: Rank the attached compounds in order of increasing acidity.
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Q: 5. Formic acid (HCOOH) has a pka of 3.75. (a) What percent of formic acid dissociates at pH 4?
A: Given, pKa of formic acid=3.75
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Q: Explain the trends in the acidity of phenol and the monofluoro derivatives of phenol. OH он он он F…
A: Higher the pKa lower is the acidity. If the conjugate base is stabilized, then it is more acidic.
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Q: Using the pk, table, estimate pK, values for the most acidic group on the compounds below, and draw…
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Q: 3) . Which of the following carboxylic acid containing molecules has the largest pKa value? CI ÇI CI…
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Q: Please rank the following by increasing acidity: H2Se, H2O, CH4, H2S
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Q: Aniline C6H5NH2 has a base dissociation constant (Kb) of 4.3 × 10-10. What is the conjugate acid of…
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Q: What percent of acetic acid is present in the acidic form at pH 5.0, assuming a pKa of 4.8?
A: Given,pH = 5.0pka = 4.8
Q: Solve the Attachment
A: Acids tend to lose H+ and form conjugate base. Stronger the acid, more is the Ka value and smaller…
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- 3), largest pka value? Which of the following carboxylic acid containing molecules has the ÇI COH CI ÇI CI CO2H COH .CO2H .CO2H CI CI CI (d) CI CI (a) (b) (c) (e)2b. Arrange the following compounds in order of decreasing pka values. COOH O2N -COOH COOH O2N II II C. III >I> II F. III > II >I A. I> II > III B. II> III >I D. I> III > II E. II>I> III2. What are the pKa's of HCN (hydrocyanic acid), and HF (hydrofluoric acid)? Based only on those pka values, what do you expect to be the products of the reaction below? Briefly explain. HCN+HF->?
- Part B Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5 COOH(aq) + H₂O(1) C6H5COO- (aq) + H3O+ (aq) -1 The pK₂ of this reaction is 4.2. In a 0.66 mol L-¹ solution of benzoic acid, what percentage of the molecules are ionized? Express your answer to two significant figures and include the appropriate units.d. The Ka of acetic acid (found in vinegar) is 1.8×10-5. Then the pKa of formic acid isWhich of the following will have the highest pka? A. Co3?. B, HCO31 C. H2CO3 D. H2SO3 E. HCIO3
- (B) (C) OH OH 1. Me3SICN cat. Znl2 Ph OTMS Ph-C-CN H (TMS = Me3Si) OH 2. (a) LDA, THF, -78 °C to -25 °C Y' (b) (i-Prl)Vancomycin is an important antibiotic. It is isolated from the bacterium Streptomyces orientalis and functions by inhibiting bacterial mucopeptide synthesis. It is a last line of defense against the resistant Staph organisms that are now common in hospitals. OH HO, OH H. NHME NH H NH HO,C- “NH2 Vancomycin aglycon ОН НО In 1999, Professor Dale Boger (The Scripps Research Institute) reported a synthesis of vancomycin aglycon (aglycon = lacking a sugar) involving the following steps, among others. Compound (I) was prepared from simple starting materials by a series of steps involving forming amide bonds.Alcohols are weak organic acids, pKa 15–18. The pKa of ethanol, CH3CH2OH, is 15.9. Write equations for the equilibrium reactions of ethanol with each base. Which equilibria lie considerably toward the right? Which lie considerably toward the left? Q.) NaHCO3
- What type(s) of catalysis is/are present in the enzymatic reaction below? SCOA H-His CH SCOA Asp CH COASH CH: CO HO-C-COO" HO-C-COO H-CH, acetyl-CeA SCOA CH, CH; CH COO COO COO oxaloacetate an intermediate citrate Select one or more: a. general acid b. general base C. metal ion d. specific base e. nucleophilic f. specific acidfollowing reactions. a. HO b. HO OH OH NH₂ NH₂ H₂SO4 H₂O + 1. LIAIH4 2. H* workup Imine Formation trace acidChemistry 19. Draw the products of each reaction. using pka values decide if the equilibrium favors reactants or products. a) F3 C GH OH + OCH₂CH3 Conj.base Pka = 0.2 Conj acid (pka=16) b) [JOH+ тон + мансоз pka = 10 Conj.aud (Pka = 15-7) c) H3C NH₂ + H₂SO4 Pka = -9 .t- d) H-CEC-H+ Lí CH2CH3 pka=25 Conj. acid (pka = 10.7) Conj. aud (pka=50) Conj. base Conj. base + CO₂ Conj. base