Draw the structure of the polymer formed when this compound reacts with water, followed by heating. Draw the monomer unit, and use R1 groups to represent the point at which the monomer repeats. The R group tool is located in the charges and lone pairs drop-down menu. • You do not have to consider stereochemistry. •You do not have to explicitly draw H atoms. Do not include lone pairs in your answer. They will not be considered in the grading. IN 0 + / √n [ ] ?

As discussed in the class, the 3D printing process shown below is a special type of stereolithography called CLIP, where an oxygen permeable window is used underneath the vat of resin. Which statement is incorrect regarding CLIP? Build platform- Oxygen permeable window Printed object UV curable resin C. Dead zone - UV light beam Projector a. The oxygen abundance in the proximity of the window quenches the activated molecules hence stopping any polymerization from occurring at the direct proximity of the window b. The dead zone is an unintended outcome of the oxygen permeable window that provides a nonstick surface at the cost of slowing down the print process The dead zone in fact helps speed up the process by eliminating the need for sequential peeling of the adhered part d. The uniqueness of this process is that the entire vat of resin is depleted of oxygen apart from the resin in the proximity of permeable window. This allows for the material to cure in all layers at the same time.

(CH21/23) [References] Draw the structure of the major organic product(s) of the reaction. H₂C 1. 2 CH3MgBr, ether 2. H₂O You do not have to consider stereochemistry. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate multiple products using the + sign from the drop-down menu. 89 ? ChemDoodle 424 [F Previous Next Save and Exit

Draw the structure of the repeat unit of the polymer that results when this epoxide and this diamine are heated together: diamine epoxide H₂N You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. Do not include lone pairs in your answer. They will not be considered in the grading. • Use R1 groups to indicate the points where the polymer repeats. The R group tool is located in the charges and lone pairs drop-down menu. ۱۰ [ ]# NH₂ ChemDoodleⓇ

+ Polymers may be composed of thousands of monomers. Draw two repeat units of the polymer (dimer) formed in this reaction. Assume there are hydrogen atoms on the two ends of the dimer. Ignore inorganic byproducts. Incorrect, 2 attempts remaining BF3, H₂O Select to Draw Please select a drawing or reagent from th Incorrect, 2 attempts remaining The total number of carbons in the parent chain is incorrect. Review the reaction conditions including starting materials and/or intermediate structures and recount the number of carbon atoms in the parent chain of your structure. Retry

In a groundwater 1,1,1 trichloroethane, hexachlorobenzene and 1,1,2 trichloroethane have leached from an underground industrial landfill. Which compound would you expect to move fastest with groundwater? Which would be easiest to remove by air stripping? Which would be best to remove by adsorption?

1. Compare the two polymers below. Which one would you expect to be stronger? Explain your answer. Polymer A Polymer B -CH₂-CH₂-CH₂-CH₂-CH₂- brofor H H 2. Explain why each of the following molecules are named incorrectly. Provide the correct name for each. a. 4-methylbutane b. 3,4-dimethylpentane c. 2,2-dimethyl-3-ethylnonane d. 1-phenylpentane

Draw the structure of the major organic product(s) of the reaction. 99-85 / CI You do not have to consider stereochemistry. • All carboxyl and amino groups should be drawn in the neutral form. • If no reaction occurs, draw the organic starting material. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corn- Separate multiple products using the sign from the drop-down menu. . *** OH HCI 000- /IF [References] Provinu

8. For the following molecule, draw the monomers (3T) *Hint* there are three different monomers a. What byproducts (if any) would form during this polymerization? b. Type of polymerization that occurred: (1T) (1T) N. H2N СООН N. H. CH3 ZI