Which step does NOT occur in the mechanism for Friedel-Crafts alkylation of benzene with ethyl chloride?

Name the major product or products from the reaction shown. Describe the directing effects of the substituents that lead to the orientation of the product. Be specific. Why does it direct where it does?

Pick ONE of the following retrosynthetic problems.  Name or describe the steps and reagents to complete the synthesis.            There is partial credit for this question, so write whatever you know!

Choose the major product(s) for the reaction shown below.  Choose all that apply.     

The hybridization of the carbon with the anion in the molecule below is [A].  The type of orbital in which the lone pair resides is [B].        

Match the following components of an image intensifier tube with the appropriate type of energy. (may have multiple answers and used more than once or not at all)

____________________ is utilized to maintain consistent fluoroscopic image quality.

The tomographic ampltiude during tomography must at least match the:

Which of the following has been identified as the target for lowering the risk of cardiovascular disease when addressing issues of lipids and lipoproteins?

The normal blood pressure response to dynamic upright exercise consists of a progressive increase in