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Chapter 12: PROBLEM 12.4 (page 459)

Question: Which alkene in each pair has the larger Heat of hydrogenation?

a.

b.

Short Answer

Expert verified

Answer

a.


b.

Step by step solution

01

Heat of hydrogenation

When (C=C) is broken and new (C-H) are formed, some energy is released out, known as the heat of hydrogenation.

The stability of alkenes is inversely proportional to the heat of hydrogenation.

02

Stability of alkenes

One of the factors that affect the stability of alkenes is substituents. The number of substituents and their position defines the stability of alkenes.

03

Determination of alkenes with larger heat of hydrogenation

a. Cis alkenes are less stable than trans alkenes due to steric hindrance; therefore, cis alkenes will have larger heat of hydrogenation.

Cis and trans alkene

b. As the number of substitutions increases, the stability increases as hyperconjugation increases.

Di and Tri substituted alkene

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Most popular questions from this chapter

Question: Draw the products formed when both cis- and trans-but-2-ene are treated with a peroxyacid followed by 鈥� OH (in H2O ). Explain how these reactions illustrate that anti-dihydroxylation is stereospecific.

Question: Given that syn addition of H2 occurs from both sides of a trigonal planar double bond, draw all stereoisomers formed when each alkene is treated with H2 .

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Question: A chiral alkyne A with molecular formula C6H10 is reduced with and Lindlar catalyst to B having the R configuration at its stereogeniccentre. What are the structures of A and B?

Question: Label each reaction as oxidation, reduction, or neither.

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d.

Question: Devise a synthesis of each compound from the indicated starting material, organic compounds containing one or two carbons, and any other required reagents.
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