Chapter 14.1, Problem 1P

Which of the following fragments produced in a mass spectrometer will be accelerated through the analyzer tube?

${\text{CH}}_{\text{3}}{\stackrel{\dot{}}{\text{C}}\text{H}}_{\text{2}}{\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\stackrel{\text{+}}{\text{C}}{\text{H}}_{\text{2}}{{\text{[CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{3}}\text{]}}^{\begin{array}{l}\text{+}\\ \text{.}\end{array}}{\stackrel{\dot{}}{\text{C}}\text{H}}_{\text{2}}{\text{CH=CH}}_{\text{2}}\stackrel{\text{+}}{\text{C}}{\text{H}}_{\text{2}}{\text{CH=CH}}_{\text{2}}$