Cyclobutadiene (1) can be hydrogenated to give cyclobutane (2). Similarly, cyclo

Question

Cyclobutadiene (1) can be hydrogenated to give cyclobutane (2). Similarly, cyclobutene (3) also can be hydrogenated to give cyclobutane.

Which statement is accurate? You can ignore differences in angle strain between 1 and 3 for the purposes of this comparison.

Select one:

a. the magnitude of ?HH for cyclobutadiene = 2 × the magnitude of ?HH for cyclobutene.

b. the magnitude of ?HH for cyclobutadiene > 2 × the magnitude of ?HH for cyclobutene.

c. the magnitude of ?HH for cyclobutadiene < 2 × the magnitude of ?HH for cyclobutene.

Explanation / Answer

Cyclobutadiene (1) can be hydrogenated to give cyclobutane (2). Similarly, cyclobutene (3) also can be hydrogenated to give cyclobutane.

Answer = a. the magnitude of ?HH for cyclobutadiene = 2 × the magnitude of ?HH for cyclobutene.

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