Second Exam_2006_Key

Second Exam_2006_Key - (I Answer the following questions...

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(I) Answer the following questions true of false (3 points each). T (1) Reactive dienophiles in Diels-Alder cyclization reactions generally have one or more electron-withdrawing substituents F (2) The reactive conformation of the diene in a Diels-Alder reaction is s-trans . T (3) An increase in the number of conjugated double bonds in a polyalkene normally results in an increase in ! max in the UV-Vis spectra of the molecule. F (4) The enthalpy of hydrogenation of 1,3 pentadiene is more negative than the enthalpy of hydrogenation of 1,4 pentadiene. F (5) 1,3,5,7-Cycooctatetraene is an aromatic compound T (6) Electron-donating substituents direct electrophiles towards substitution at the ortho and para positions of a benzene ring. T (7) Electron-donating substituents deactivate an aromatic ring towards nucleophilic aromatic substitution. T (8) The -Br substituent direct electrophiles towards substitution at the ortho and para positions of a benzene ring.
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Second Exam_2006_Key - (I Answer the following questions...

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