Which bases can deprotonate acetylene? The pKa values of the conjugate acids are given in parentheses. a. CH3NH (pK, = 40) b. Co,?- (pKa = 10.2) c. CH2 = CH" (pKa = 44) d. (CHa),CO (pKa = 18) %3!
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- I mostly need help setting up how to do the math for these problems. I also need help with knowing how to find which acid is the strongest. Give the Ka or pKa values that should be entered in the blanks below. pKa = -log10ka ; 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?Which bases can deprotonate acetylene? The pKa values of the conjugate acids are given in parentheses. a. CH3NH− (pKa = 40) b. CO32− (pKa = 10.2) c.CH2=CH− (pKa = 44) d.(CH3)3CO− (pKa = 18)Which of the following acid/conjugate base pairs has a pKa value of 9.44? A. Ammonium/ammonia B. carboxylic acid/carboxylate C. imidazolium/imidazole
- Which of the following has highest priority based on CIP? A. -C=C B. -C(COOH) C-C(CH3)3 D.-C-NH3 E. - CH,CI O a. C O b. D О с.А O d. B O e. EWhy does methyl orange have a lower pKa value (pKa~3.5) than methyl red (pKa ~5.1)?Shown below it the equilibrium between guanidine and the guanidinium ion. NH₂ NH pKa = 13.60 H₂N-C-NH₂ H₂N-C-NH₂ Guanidinium Ion Guanidine The pKa of the guanidinium ion is 13.60. At what pH is guanidine 35% ionized? Type your answer...
- Identify the following antioxidant molecule. A. alpha tocopherol hydroquinone B.dehydroascorbic acid CH3 CH3 C. alpha tocopherol semi-quinone \ / D. ascorbic acid C = C E. alpha tocopherol quinone / \ : O – C C – O CH3 \\ // \ / C – C C – CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH3 / \ / l l l CH3 CH2– CH2…Dicarboxylic 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 bondingGive 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?
- Why are the carboxylic acid groups of the amino acids so much more acidic (pK a ~ 2) thana carboxylic acid such as acetic acid (pKa = 4.76)?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 XX(22) What is the product of the following reaction sequence? (1) Br2, H20 ? Ph. Ph (2) isolate product (3) NaH, THF OH Ph Ph. Ph. Ph D Ph. Ph Ph A Br B (23) What is the best way to make compound X? Na+ (b) (c) (d) (a) но. Br- Br. O. Br Br OH Na* (24) Which of the following compounds is aromatic? (c) (b) (d) (a) (25) What is the product obtained from the reaction below? (NaNH2, NH3 (a) (b) O Na* ? (2) (c) (d) no reaction O Na"