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Chapter 2: Problem 104

A reaction that does not lead to an alkene is (a) Kolbe's electrolysis (b) \(\alpha\) -elimination (c) Wittig reaction (d) dehalogenation

Short Answer

Expert verified
Answer: \(\alpha\)-elimination

Step by step solution

01

Option (a): Kolbe's Electrolysis

Kolbe's electrolysis involves the electrolysis of a carboxylate solution, leading to the formation of alkanes and carbon dioxide. There is no formation of an alkene in this reaction. The general reaction can be represented as: 2 RCOO- + 2 H2O → 2 CO2 + 2 R-H + 2 OH-
02

Option (b): \(\alpha\) -elimination

In an \(\alpha\)-elimination reaction, two groups are lost from the same carbon atom, and it does not lead to the formation of an alkene. An example of an \(\alpha\)-elimination reaction is as follows: R-C(-X)(-Y) → X-Y + R
03

Option (c): Wittig Reaction

The Wittig reaction is an organic reaction used to convert aldehydes or ketones into alkenes. A phosphonium ylide is the reactive intermediate in this reaction. It reacts with the carbonyl compound to produce an alkene. The general reaction can be represented as: Ph\(_3\)P=CR\(_2\) + R\(_1\)CO → Ph\(_3\)P=O + R\(_1\)C=CR\(_2\)
04

Option (d): Dehalogenation

Dehalogenation is a reaction in which a halogen atom is removed from a substrate molecule. In the context of organic molecules, dehalogenation can lead to the formation of an alkene when two halogens are removed from adjacent carbons. This is also known as a double dehydrohalogenation reaction. The general reaction is as follows: R-CH(X)-CH(Y)-R' → R-CH=CH-R' + HX + HY From the analysis of each option, we can conclude that:
05

Conclusion

Option (b) \(\alpha\)-elimination is the reaction that does not lead to the formation of an alkene.

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Most popular questions from this chapter

Identify the incorrect statement among the following (b) The dipole moment of \(\mathrm{CH}_{2} \mathrm{Cl}_{2}\) is greater than that of \(\mathrm{CH}_{3} \mathrm{Cl}\). (c) The cis isomers become increasingly less stable as the size of the \(\mathrm{R}\) groups increase. (d) Alkenes with two identical groups on the same doubly bonded carbon have no geometrical isomers.

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