24 Jun Organic Structures Shapes and Isomerism
Organic Structures Shapes and Isomerism Part 2 Kathy Carrigan Version 42-0185-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiments questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students writing of lab reports by providing this information in an editable file which can be sent to an instructor. Questions Part I Section 1 A. Would the structures you have produced in step 1 be considered isomers of one another? Explain the basis for your answer. B. What are the bond angles and molecular geometry around the carbon atoms? Part I Section 2 A. Is this possible with the double bond? Describe what you see. B. What is the bond angle and molecular geometry around the 2 middle carbon atoms? Part I Section 3 A. What are the bond angles and molecular geometry around the double bonded carbons? B. Can your cis-2-butene model be converted into the trans-2-butene model without breaking bonds? C. The cis- and trans-2-butenes are called geometric isomers. Why are they given this name? D. Define the term structural isomer (see Organic Structures Part 1) and explain how it differs from a geometric isomer. Part I Challenge Questions (required) Indicate whether each of the following compound pairs are geometric isomers, structural isomers, or not isomers at all. Write the names for the compounds under each formula. Names Are these structures isomers? If so what type? CH3 CH3 CH CH3 CH3 CH2 CH2 CH3 Names Are these structures isomers? If so what type? Cl Cl Cl CH3 CH Cl CH2 and CH3 CH CH2 Names Are these structures isomers? If so what type? Part II: Aromatic Hydrocarbons and Resonance A. What is the geometry of each of the carbons in benzene? B. Draw the structural formula for methylbenzene. (Note: draw the structure using the drawing program and paste it in here. We do not want you to scan in this as a pdf file. If you are unable to draw the structure skip it and answer the rest of the question.) Part III: Alkynes A. Construct a model of 1-propyne and draw its structural formula. Part IV: Functional Groups Part IV Section 1 A. Construct a model, using the red atom with two prongs for oxygen, then draw the structural formula for 1-propanol, C3H7OH. (The common name is propanol, or propyl alcohol) Why is oxygen represented by the “bent” structure? B. Construct a model, then draw the structural formula for 2-propanol, C3H7OH. (The common name is isopropanol, or iso
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