Ranking acidity and hydrogen atoms


Assignment:

Question 1. What is the pKa of hydrogen HA?

919_pKa of hydrogen .jpg
Question 2. What is the pKa of hydrogen HB?

Question 3. What is the pKa of hydrogen HC?

Question 4. What is the pKa of hydrogen HD?

Question 5. The epoxyserinones represent some of the first compounds discovered from fungi cultured from deep-ocean sediment collections. What is the hybridization of the atom labeled A?

1600_Epoxyserinones.jpg

Question 6. What is the formal charge of the atom labeled B?

Question 7. What is the magnitude of the bond angle labeled C?

Question 8. What set of equilibrium arrows indicates the equilibrium position of the following reaction?

754_Equilibrium arrows.jpg

Question 9. Rank the following compounds from 1 to 4 by the strongest acid (1) to weakest acid (4). Blackboard will ask you to assign the appropriate position number (1, 2, 3, or 4) to each compound.

173_Strongest acid .jpg

 
Question 10. What is the hybridization of the atom labeled X?

1322_Hybridization of atom .jpg
Question 11. What is the best estimate of the magnitude of the bond angle labeled Y?

Question 12. What are the correct partial charges of the atoms labeled Z1 and Z2?

Question 13. Calculate the G° of a reaction at T = 25°C that has an equilibrium constant (K) of 0.56. Is the G° value negative, positive, or zero?

Question 14. The strain energy (kcal/mole) of a single CH3:R gauche interaction (where R represents a generic alkyl group) for the following compound is _________ kcal/mole. Please enter the numerical value, rounded to two decimal places and without units, into the Blackboard answer.

101_Strain energy .jpg
Question 15. Assemble a model of the compound below in the conformation shown. What is the correct position of the amine substituent?

1472_Model of compound .jpg

 
Question 16. Which of the following statements is correct?
Compound P is a stronger acid than compound Q.
Compound P is a weaker acid than compound Q.
Compound P and compound Q have equal strength as acids.

2094_Compounds.jpg

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Chemistry: Ranking acidity and hydrogen atoms
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