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Chapter 1: 24P (page 82)

a. CHF=CHF

b. F2C=CHG2

c. CH2=CHCH2CH3

d.

e.

f.

Short Answer

Expert verified

Only compound (a) will show cis-trans isomerism.

Step by step solution

01

Cis-trans isomerism

Cis-trans isomerism is observed in alkenes and alicyclic compounds. For an alkene to show cis-trans isomerism, it must have two different substituents.Cis-trans isomers are geometric isomers that are the subset of stereoisomers.

02

Rules for displaying cis-trans isomerism

The compounds with the following substitution pattern would not show cis-trans isomerism.

Cis-trans isomerism would not be observed for alkenes with this substitution pattern.

03

Determination of compounds that show cis-trans isomerism

Compounds (b), (c), and (d) would not show cis-trans isomerism.

Cis-trans notation cannot be used for alkenes with more than two different substituents. Hence, the compound (e) and (f) would not show cis-trans isomerism. For these compounds E/Z notation system is appropriate.

The only compound that will exhibit cis-trans isomerism is compound (a). Cis-trans isomers of compound (a) are,

Cis-trans isomerism of compound (a).

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Most popular questions from this chapter

In the following sets of resonance forms, label the major and minor contributors and state which structures would be of equal energy. Add any missing resonance forms.

Allene, CH2=C=CH2, has the structure shown below. Explain how the bonding in allene requires the two=CH2 groups at its ends to be at right angles to each other.

Allene

Draw a Lewis structure for each compound. Include all nonbonding pairs of elctrons
(a CH3COCH2CHCHCOOH (b) NCCH2COCH2CHO
(c) CH2CHCH(OH)CH2CO2H (d) CH2CHC(CH3)CHCOOCH3

Draw the important resonance forms of the following cations and anions:
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