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CH, H,C CH, Critical Thinking Question (CTQ): 18. Write the molecular formula for each of the compounds above.

CH, H,C CH, Critical Thinking Question (CTQ): 18. Write the molecular formula for each of the compounds above.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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E. Nomenclature of Alkene Stereoisomers (E/Z and trans/cis) Stereoisomer = compounds with the same molecular formula that differ only in the arrangement of their atoms in space. (Free rotation around double bonds cannot occur unless the double bond is broken and reformed.) (Cyclic alkenes of less than 7 carbons are always cis due to the size of the ring and do not have a cis prefix.) CH, H3C CH3 Critical Thinking Question (CTQ): 18. Write the molecular formula for each of the compounds above. 19. Does the name 2-butene indicate which of the stereoisomers above is being referred to? 20. To indicate the difference between alkenes that have 2 substituents across a double bond, use the prefix trans (across the double bond relative to each other) or cis (same side of the double bond to each other). Thus, the correct IUPAC names for the compounds above are cis-2-butene and trans-2- butene. 21. Add cis or trans where needed to the IUPAC names in the alkene CTQ question above. When more than 2 substituents exist around a double bond, cis and trans can no longer accurately describe the stereoisomers and a different systems is used, the Cahn-Ingold-Prelog convention of E and Z. This system can also be used for alkenes with only 2 substituents. It will be discussed when we cover the chapter on Alkenes and Alkynes later in the semester.
Transcribed Image Text:E. Nomenclature of Alkene Stereoisomers (E/Z and trans/cis) Stereoisomer = compounds with the same molecular formula that differ only in the arrangement of their atoms in space. (Free rotation around double bonds cannot occur unless the double bond is broken and reformed.) (Cyclic alkenes of less than 7 carbons are always cis due to the size of the ring and do not have a cis prefix.) CH, H3C CH3 Critical Thinking Question (CTQ): 18. Write the molecular formula for each of the compounds above. 19. Does the name 2-butene indicate which of the stereoisomers above is being referred to? 20. To indicate the difference between alkenes that have 2 substituents across a double bond, use the prefix trans (across the double bond relative to each other) or cis (same side of the double bond to each other). Thus, the correct IUPAC names for the compounds above are cis-2-butene and trans-2- butene. 21. Add cis or trans where needed to the IUPAC names in the alkene CTQ question above. When more than 2 substituents exist around a double bond, cis and trans can no longer accurately describe the stereoisomers and a different systems is used, the Cahn-Ingold-Prelog convention of E and Z. This system can also be used for alkenes with only 2 substituents. It will be discussed when we cover the chapter on Alkenes and Alkynes later in the semester.
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