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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

Question: Draw a Lewis structure for each species.

  1. N2H4
  2. N2H2
  3. (CH3)2NH2Cl
  4. CH3CN
  5. CH3CHO
  6. CH3S(O)CH3
  7. H2SO4
  8. CH3NCO
  9. CH3OSO2OCH3
  10. CH3C(NH)CH3
  11. (CH3)3CNO

Question: Draw Lewis structure for the following compounds and ions, showing appropriate formal changes.

a. [CH3OH2]+

b. NH4Cl

c. (CH3)4NCl

d. NaOCH3

e. +CH3

f. -CH3

g. NaBH4

h. NaBH3CN

i. (CH3)2O-BF3

j. [HONH3]+

k. KOC(CH3)3

l. [H2C=OH]+

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

Which of the following compounds show cis-trans isomerism? Draw the cis and trans isomers of those that do.

  1. CHF=CHF
  2. F2C=CH2
  3. CH2=CH-CH2-CH3

e.

f.

(a) Two compounds of formula C4H10

(b) Two compounds of formula C2H6O

(c) Two compounds of formula C2H7N

(d) Three compounds of formula C2H7NO

(e) Three compounds of formula C3H8O2

(f) Three compounds of formula C2H4O
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