Which one of the following compounds contains alpha-hydrogens with a pk, value of about 13? CH3CCH3 CH,CCH,COCH3 CH3CH CH,ČCH,CCH, CH;OCCH,COCH3
Q: Why is the pKa of the Ha protons in 1-acetylcyclohexene higher than thepKa of the Hb protons?
A: In this question, we will discuss about why pKa value for Ha proton will be greater than Hb proton.…
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Q: PKA
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Q: Why is the pKa of the Ha protons in 1-acetylcyclohexene higher than the pKa of the Hb protons?
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Q: Estimate the pKa values of the following compounds: a. CH3CH2CH2NH2 b. CH3CH2CH2OH c.CH3CH2COOH…
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Q: Determine the Ka for CH3NH3+ at 25C. The Kb for CH3NH2 is 4.24x10^-4
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- c. Explain the difference of pka of the following two compounds Overcas trans are pka H HADICH 35 Η Н han cis 43 I I H Ye more stable than 1 XXGive the Ka or pKą values that should be entered in the blanks below. pka = -log10 Ka; Ka = 10-pka (a) hydrocyanic acid: Ka = 4.92 x 10-10; pka = (b) acetic acid: Ka=;pka = 4.75 (c) lactic acid: Ka = 8.40 x 10-4; pka = (d) formic acid: Ka=;pKa = 3.75. (e) Which of these acids is the strongest?CH3-C-OH Keq + H2N-C2H5 CH3-C-o H3N-C2H5 + pka = 5 pKa = 11 or Keq = 106 ; Keq > 1 (favors in the forward reaction) %3D PA log Keq = 11 - 5 = 6 NH4* + H20 pka = 9 NH3 + H3O* pKa = -2 %3D log Keq = -2 - 9 = -11 Keg = 10-11 Keg < 1, reaction favored in the reverse direction, Try: Write the product of the following acid base reactions. Also calculate the Keq for each reaction P + HCI: CH3CH,ÖH + CH3LI OH t CHq Li 2 NõLi t CH Chapter 5- Chemical Reactions and Mechanisms (307 Fall 2020) KSethi
- CH Post Lab ET O 44 Is saloviglvoyig'lo wouna inenimob stotis W A+H3N-CH-C-OH F CH-CH3 CH3 5. The structure of amino acid valine (Val) is as follows: The pKa for the carboxylic acid group is 2.29; the pKa for the protonated amine group is 9.74. What is the pl value of Val?Phosphoric acid has pka values of approximately 2, 7 and 12. What are the relevant pka for the phosphodiester contained in sn-glycero-3-phosphocholine, a natural glycerophospholipid? O 2 only O 2,7, and 12 O None are correct O2, and 7 only O7 and 12 onlyMatch the pKa values to the appropriate compound. pKa values: 0.28, 1.24, 2.66, 2.86, and 3.12. Compounds: (a) FCH2COOH; (b) CF3COOH; (c) F2CHCOOH; (d) ICH2COOH; (e) BrCH2COOH.
- 2. Calculate the pKa for thefollowing:a. trans – cinnamic acid; Ka = 3.7 x 10-5b. saccharin, Ka = 2.5 x 10-2Dicarboxylic acids have two pKa's. For maleic acid (cis-2-butenedioic acid) these are pKa¹ = 2.0, and pK₂² = 6.3 For fumaric acid (trans-2-butenedioic acid) these are pka¹ = 3.0, and pk₂² = 4.5 Which factor best explains why the cis-isomer has a smaller pK₂¹ and a larger pK₂² than the trans-isomer? 2 a. Intramolecular dipole repulsion b. Intramolecular steric hindrance c. Selective solvation in water d. Intramolecular hydrogen bondingEstimate the pKa values of the following compounds: Drag the appropriate labels to their respective targets. Note: not all labels will be used. pK₁ <0 pKa ~ 5 pK₁ ~ 10 pKa ~ 15 pKa~ 40 CH3CH₂CH₂NH2 CH3CH₂CH₂OH CH3CH₂COOH Reset CH3CH₂CH₂NH3 Help
- Which is strong bp-bp repulsion or bp-lp repulsion?Which of the following substances would be expected to have the largest pK,? → # 3 CH-CH-NH e CH3-CH₂-OH 0 CH3-C-OH CH3-C-H с LA $ 4 r % 5 L t 11 Oll A 6 hp y & 7 u * 8 O ( 9Most common amines (RNH2) exhibit pKa values between 35 and 45. R represents the rest of the compound (generally carbon and hydrogen atoms). However, when R is a cyano group, the pKa is found to be drastically lower: H H Incorrect. 人 R N H PK = 35-45 N N H PK = = 17 (a) Explain why the presence of the cyano group so drastically impacts the pKa. ○ When R is a cyano group, the acidic proton is on an sp-hybridized atom. ○ When R is a cyano group, the conjugate base is destabilized by resonance. ○ When R is a cyano group, the conjugate base is destabilized by inductive effects. ● When R is a cyano group, the conjugate base is stabilized by resonance.