Organic Chemistry

3. For the following compound pairs, identify the most acidic proton for each molecule and identify the stronger acid. Hint: look for similar patterns in the pK, table.

6. In solution, aliphatic amines like cyclohexylamine (left, pK, of the conjugate acid = 10.45) are stronger bases than aromatic amines like aniline (right, pk, of the conjugate acid = 4.63). Why?

7. Draw out the products of the following Lewis acid-base reactions and label the reactants as Lewis acid, Lewis base, nucleophile, and electrophile.

You are performing a transesterification (like in prac 4) and need to get your reagents ready. You are starting with 20.60 grams of your triglyceride which has a molecular weight of 927.48 g mol¹¹. a) How many moles of triglyceride do you have? (3 marks) b) How many grams of methanol will you need if the ratio of triglyceride to methanol is 1:12 in your reaction? Ensure you report to the correct number of significant figures for both and show your working. No marks without working. (3 marks) c) You are getting assessed on your use of significant figures. Why is being able to do things like report to the correct number of significant figures and round correctly and reliably important? (1 mark) d) Give a 1-2 sentence example of where proper use of significant figures might be important in the workplace. (1 mark)

Question 51 (0.0001 points) Saved (5 marks) Add bonds (double or triple bonds) and lone pairs to the following incomplete structure where required. Include all formal charges where appropriate. Hand write your answer. Select the tickbox when you have completed the question.

Question 52 (0.0001 points) (5 marks) The reaction 2HCl(g) = H₂(g) + Cl₂(g) has Kc = 3.2 x 10-34 at 25 °C. If the reaction vessel initially contains 0.0350 mol L-1 of HCI, what will be the concentrations of H₂ and Cl₂ at equilibrium?

Question 55 (0.0001 points) (8 marks) Hand write your answers to the questions below. Select the tickbox when you have completed this question.

Question 54 (0.0001 points) (4 marks) Consider a galvanic cell involving silver (I) and iron (II) and the corresponding Ag and Fe electrodes (use the data in Table 12.1 from the text). Hand draw this galvanic cell include the details below. a) Draw a sketch of the cell (1 marks) b) Clearly identify the anode and cathode (1 mark) c) Write the balanced overall reaction (1 marks) d) Which electrode will lose mass (0.5 mark) e) Outline the direction of the electron flow (0.5 mark) I have hand written my answer

Question 57 (0.0001 points) (3 marks) Hand write your answers to the questions below. Select the tickbox when you have completed this question. Draw the structure of the following compound: trans-2-bromocyclohexanol

Question 56 (0.0001 points) (5 marks) Hand write your answers to the questions below. Select the tickbox when you have completed this question. a. Label with asterisks (*) all of the stereocentres in the molecule shown above. (1 mark) b. How many stereoisomers are possible? (1 mark) c. Draw the structures of one pair of enantiomers for the above molecule. (Hint: You should draw two structures using wedge and dashed wedge bonds.) (3 marks)