Chapter 1, Problem 22PP

Practice Problem 1.22

Which of the following alkenes can exist as cis-trans isomers? Write their structures. Build hand-held models to prove that one isomer is not superposable on the other.

(a) ${\text{CH}}_2={\text{CHCH}}_2{\text{CH}}_3$ (c) ${\text{CH}}_2=\text{C}{\left({\text{CH}}_3\right)}_2$

(b) ${\text{CH}}_3\text{CH}={\text{CHCH}}_3$ (d) ${\text{CH}}_3{\text{CH}}_2\text{CH}=\text{CHCl}$