Which of the following is not a good method to make 2,2-dimethylpropanoic acid?

Which of the following is the best method to prepare aspirin?

Predict the final product for the following reaction sequence.

What is the product of the following reaction?  

Why doesn’t nucleophilic acyl substitution stop at the tetrahedral intermediate?

What is the Aldol addition product formed from the reaction of acetone, (CH3)2CO, with itself?

Which structure is consistent with the following 1H NMR spectrum?

Bonus question An organic  compound with a molecular formula C9H9O, has the following 1H NMR data: 1.18 ppm (triplet, 3H), 2.59 ppm (quartet, 23H), and 7.64 ppm (broad singlet,  5H). Provide the IUPAC name of the structure that matches the above information.

Which of the following reagent(s) can be used to carry out the following conversion?  

Bonus question Provide an efficient stepwise synthesis for the following.        The answer should be entered as in the following example: (this is an example!) 1. NaNH2   2. CH3CH2Br   3. H2, Lindlar’s Cat.    4. BH3, THF   5. H2O2, NaOH                          (Keep three spaces between each step) All chemicals and reagents  structures should be correct and with the proper sequence. No partial credit.