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Chapter 8: Q70aE. (page 262)

We鈥檒l see in the next chapter that alkynes undergo many of the same reactions that alkenes do. What product might you expect from each of the following reactions?

Short Answer

Expert verified

The reaction is an example of electrophilic addition. A brominium ion is formed when alkyne undergoes elecrophilic addition reaction.

Step by step solution

01

Introduction

The reaction is an example of electrophilic addition. A brominium ion is formed when alkyne undergoes elecrophilic addition reaction.

02

Chemical reaction involved

03

Reaction of alkyne with halide

When alkyne reacts with halide, they undergo an additional reaction to form halogen substituted alkene. Alkyne followsMarkovnikovregiochemistry in which two added halogen atoms are always in a trans relationship with each other.

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Most popular questions from this chapter

When an unsymmetrical alkene such as propene is treated with N-bromosuccinimide in aqueous dimethyl sulfoxide, the major product has the bromine atom bonded to the less highly substituted carbon atom. Is this Markovnikov or non-Markovnikov orientation? Explain

Reaction of 2-methylpropene with CH3OH in the presence of H2SO4

catalyst yields methyl tert-butyl ether, CH3OC(CH3)3, by a mechanism

analogous to that of acid-catalyzed alkene hydration. Write the mechanism,

using curved arrows for each step.

Compound A has the formula C8H8. It reacts rapidly with KMnO4to giveCO2 and a carboxylic acid, B (C7H6O2), but reacts with only 1 molar equivalent of H2on catalytic hydrogenation over a palladium catalyst. On hydrogenation under conditions that reduce aromatic rings, 4 equivalents ofH2 are taken up and hydrocarbon C (C8H16)is produced. What are the structures of A, B, and C? Write the reactions.

Question:Which reaction would you expect to be faster, the addition of HBr to cyclohexene or 1-methylcyclohexene? Explain.

How would you distinguish between the following pairs of compounds using simple chemical tests? Tell what you would do and what you would see.

(a) Cyclopentene and cyclopentane

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