The bond length of the indicated C-C single bond in hexa-1,3,5-triene is about 146 pm, which is considerably shorter than that in ethane, H3C-CH3. (a) How much shorter is it? Hint: See Figure 14-2, page 685. (b) Which occupied T MOS (obtained in Problem 14.32) help decrease this bond length? (c) If an electron were promoted from the HOMO to the LUMO, would the length of the C-C single bond increase, decrease, or stay roughly the same? Explain. 146 pm

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The bond length of the indicated C-C single bond in hexa-1,3,5-triene is about
146 pm, which is considerably shorter than that in ethane, H3C-CH3.
(a) How much shorter is it? Hint: See Figure 14-2, page 685.
(b) Which occupied T MOS (obtained in Problem 14.32) help decrease this bond length?
(c) If an electron were promoted from the HOMO to the LUMO, would the length of the
C-C single bond increase, decrease, or stay roughly the same? Explain.
146 pm
Transcribed Image Text:The bond length of the indicated C-C single bond in hexa-1,3,5-triene is about 146 pm, which is considerably shorter than that in ethane, H3C-CH3. (a) How much shorter is it? Hint: See Figure 14-2, page 685. (b) Which occupied T MOS (obtained in Problem 14.32) help decrease this bond length? (c) If an electron were promoted from the HOMO to the LUMO, would the length of the C-C single bond increase, decrease, or stay roughly the same? Explain. 146 pm
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