Chapter 21, Problem 21.47P

What alkyl halide is needed to prepare each Wittig reagent?

a. ${\text{Ph}}_{\text{3}}\text{P}={\text{CHCH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}$ b. ${\text{Ph}}_{\text{3}}\text{P}=\text{C}{\left({\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\right)}_{\text{2}}$ c. ${\text{Ph}}_{\text{3}}\text{P}=\text{CHCH}={\text{CH}}_{\text{2}}$