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Chapter 7: Q45 P (page 315)

Which of the following pairs are keto–enol tautomers?

Short Answer

Expert verified

Only c and e are keto-enol tautomerism

Step by step solution

01

Definition of keto-enol tautomerism-

keto–enol is a chemical equilibrium between a keto form (a ketone or an aldehyde) and an enol is referred to as tautomerism (an alcohol). The keto and enol forms are referred to as tautomers. Because the interconversion of the two forms requires the movement of an alpha hydrogen atom as well as the reorganisation of bonding electrons, the isomerism qualifies as tautomerism.

02

Only c and e are keto-enol tautomerism

and

Displays keto-enol tautomerisation. An OH group is bonded to a sp2 carbon in an enol tautomer. The structures in d are not enol tautomers because the oxygen is not on the same carbon.

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Most popular questions from this chapter

Draw a condensed structure for each of the following:

a.2-hexyne

b.5-ethyl-3-octyne

c.methylacetylene

d.vinylacetylene

e.methoxyethyne

f.sec-butyl-tert-butylacetylene

g.1-bromo-1-pentyne

h.5-methyl-2-cyclohexenol

i.diethylacetylene

j.di-tert-butylacetylene

k.cyclopentylacetylene

l. 5,6-dimethyl-2-heptyne

What ketones would be formed from the acid-catalyzed addition of water to 3-heptyne?

What is the major product of each of the following reactions?

Drawing on what you know about the stereochemistry of alkene addition reactions:

a. Write the mechanism for the reaction of 2-butyne with one equivalent of Br2.

b. Predict the configuration of the product of the reaction.

Name the following:
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