MAT 100 Final: MATH 101 Princeton 101FFinal Exam 02 03
Document Summary
Some answers to the chemistry 301-301a final examination, january 12, 2005. Bonds made = 1 pi bond and 2 sigma bonds = 66 + 2 x 85. = 236 kcal/mol so this reaction is exothermic by 236 198 = 38 kcal/mol (b) 2 x 85 - 90 = 170 - 180 kcal/mol so this reaction is also exothermic, again by 170-132 = about 38 kcal/mol. In fact we should correct this value for the ca. 20 - 25 kcal strain in cyclobutane, which brings the number down to about 20 kcal/mol. If you knew this, fine, if not, now you do. Here are the mos for all the species involved in reaction (a): Notice that both homo-lumo interactions allow both the new sigma bonds to be formed in cyclohexene. Homo (ethene) lumo (butadiene) is shown below, but. By contrast, the homo-lumo interaction for the combination of two ethenes leaves one bond of cyclobutane unmade.
