Pregunta 1

Which Wittig reagent could not be prepared?

Which Rx group would provide the fastest SN1 reaction? Write an essay that explains your choice. Include diagrams, structures and mechanisms to support your argument.

Unlike aldehydes and ketones, esters cannot be reduced by NaBH4, but are readily reduced by LiAlH4. Explain this observation in a short essay. Include diagrams and structures to support your logic. Your reasoning should include a discussion of the ground state energies of NaBH4 vs. LiAlH4 and for ketones vs. esters. 

Rank in order of increasing potential energy of the cyanohydrin (1 = lowest potential energy; 4 = highest potential energy).

Write a forward synthesis for each transformation below.  Each reaction arrow should represent one synthetic step. Draw the major product after each step.

Rank in order of increasing boiling point (1 = lowest; 4 = highest boiling point).

In the image below, what is structure 3?

What is the correct pathway of blood flow starting at the Right atrium to the Left atrium? (Be sure to mention the correct valves, chambers, organs, vessels, etc.)    X –> Y –> Z 

Which hormone is known for milk ejection and uterine contractions?