Name: 5.) Use of the polygon method predicts that cyclobutadiene has how many un

Question

Name: 5.) Use of the polygon method predicts that cyclobutadiene has how many unpaired electrons a.) 0 b.) I c.) 2 d.) 3 6.) Which compound has the smallest heat of hydrogenation? a.) (E)-5-methyl-1,3-hexadiene b.) 5-methyl-1,4-hexadiene c.) 2-methyl-1.5-hexadiene d.) (E)-2-methyl-2,4-hexadiene 7) For the reaction shown below, performed at high temperatures, which of the following is the major product? HBr do go 8.) Which compound requires the lowest energy photon to cause a p to p (HOMO to LUMO) transition? a.) ethylenc b.) 1,3-butadiene c.) 1,3,5-hexatriene d.) the data cannot be predicted based on structure tinues onto next page

Explanation / Answer

5. Cyclobutadiene has 2 unpaired electrons which makes it highly unstable and reactive.

6. The most substituted alkene has the lowest heat of hydrogenation.Or More stable the alkene is, lesser is the heat of hydrogenation.

(E)-2 methyl-2,4-hexadiene has the lowest of all.

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