If a researcher interviews a group of 20-year-olds, a group of 40-year-olds, and a group of 60-year-olds about their social roles,  this would be an example of a(n) [BLANK-1] research design.

Which of the following influences on development, in Bronfenbrenner’s model, would be considered to fall into the microsystem?

According to developmental psychologists, the most significant age period of development is:

A block attached to an ideal spring oscillates on a frictionless horizontal surface (simple harmonic motion). At what point(s) in the motion is the block’s kinetic energy maximized and at what point(s) is the spring potential energy maximized? Explain how energy is exchanged between kinetic and potential forms during one cycle, and describe qualitatively what would change if there were small non-conservative losses (e.g., light damping). Write the points where the kinetic energy is maximized below, and your explanation in your scratch paper, which will be submitted to Gradescope at the end of the exam. For full credit, your answers should match, and the explanation in the scratch paper should be sufficient. (10 points)

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.