9.c. point each: 6 points total) Consider the heats of hydrogenation for the following unsaturated systems Evaluate the

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9 C Point Each 6 Points Total Consider The Heats Of Hydrogenation For The Following Unsaturated Systems Evaluate The 1 (56.45 KiB) Viewed 49 times

9.c. point each: 6 points total) Consider the heats of hydrogenation for the following unsaturated systems Evaluate the statements that follow as either or false, or select the best answer from those provided cum diene Bermind pea-1.2-dien inter ally 2920 69.8 Real) pel-2- die (6.3 kcal Inold die pows-1.4dine Increasing 275 (65.5 Real) ** bes1 Ades cond 252 660.2 kcal) 3401 573 ) 225 (53.7 energy of the alkane (pentane er hekane) Based on the values provided (and presuming all values are presented on a per mole basis): a. conjugation accounts for 15 kJ of stabilization energy. b. cumulated dienes and terminal alkynes are similarly unstable compared to the other molecules. c. a methyl group on an alkene accounts for 12 kJ of stabilization energy. d. a methyl group on an alkyne accounts for 16 kJ of stabilization energy e. all of the above statements (a, b, c, and d) are true. Penta-1,4-diene has a higher heat of hydrogenation than trans-hexa-1,4-diene because methyl groups donate electron density by induction. This is the same reason that pent-2-ync has a lower heat of hydrogenation than pent-1-yne. Because penta-1,2-diene has a larger heat of hydrogenation than penta-1,4-diene, we conclude that the cumulated double bonds of allenes are less stable than the isolated double bonds and also less stable than conjugated double bonds. All of these molecules have 2 elements of unsaturation. trans-Penta-1,3-diene can be reactive in the Diels-Alder reaction and and trans-hexa-1,4-diene cannot be reactive in the Diels-Alder reaction. Alkene energies are often compared by measuring heats of hydrogenation (AH") the heat given off during catalytic hydrogenation.