Explanation The conversion of cis- 2 -butene to trans- 2 - butene is given below. Mechanism for the above reaction is shown below. Step 1 : I 2 dissociation. 1 2 [ I 2 ( g ) → 2 I ( g ) ] Step 2 : Attachment of I atom to cis-2-butene. Step 3 : Rotation around C − C bond. Step 4: Loss of an I atom and re-formation of the carbon-carbon double bond. Step 5 : I 2 regeneration. 1 2 [ 2 I ( g ) → I 2 ( g ) ] Reaction mechanisms and bond enthalpies are given. The reaction enthalpy Δ r H can be determined using Hess’s law. For step 1 , Δ r H can be calculated as follows, Δ r H ≅ 1 2 D I − I = 1 2 ( 151 k J / m o l ) = 75.5 k J / m o l . For step 2 , Δ r H can be calculated as follows, Δ r H ≅ D C = C − D C − C − D C − I = 598 k J / m o l − 356 k J / m o l − 213 k J / m o l = 29 k J / m o l For step 3 , Δ r H can be calculated as follows, Δ r H ≅ − 5 k J / m o l

OWLv2 for Moore/Stanitski's Chemistry: The Molecular Science, 5th Edition, [Instant Access], 1 term (6 months)

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ISBN: 9781285460420

Author: John W. Moore; Conrad L. Stanitski

Publisher: Cengage Learning US

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Chapter 11, Problem 118QRT

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For the isomerization reaction of iodine catalyzed cis-2-butene the estimated energy values and energy values for the intermediate in the given figure has to be compared.

Figure 1

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Chapter 11, Problem 116QRT

Chapter 11, Problem 119QRT

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For the isomerization reaction of iodine catalyzed cis-2-butene the estimated energy values and energy values for the intermediate in the given figure has to be compared. Figure 1

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Interpretation: For the isomerization reaction of iodine catalyzed cis-2-butene the estimated energy values and energy values for the intermediate in the given figure has to be compared. Figure 1

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Interpretation:

For the isomerization reaction of iodine catalyzed cis-2-butene the estimated energy values and energy values for the intermediate in the given figure has to be compared.

Figure 1