$(a)$ $\begin{array}{*{20}{c}}
  {C{H_3} - CH - Br} \\ 
  {|\,} \\ 
  {\,\,\,\,\,\,{C_2}{H_5}} 
\end{array}$

$(b)$ $\begin{array}{*{20}{c}}
  {\begin{array}{*{20}{c}}
  {\,\,Br} \\ 
  | 
\end{array}} \\ 
  {C{H_3} - C - C{H_3}} \\ 
  | \\ 
  {\,\,\,\,\,\,\,\,\,{C_2}{H_5}} 
\end{array}$

$(c)$ $\begin{array}{*{20}{c}}
  {C{H_3}{\mkern 1mu}  - CH{\mkern 1mu}  - {\mkern 1mu} {\mkern 1mu} C{H_2}Br} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {{C_2}{H_5}\,\,\,} 
\end{array}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{Z}^{-}$$\xrightarrow[{{\text{Sublimation}}}]{{{k_s}}} \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Z}+\mathrm{Br}^{-}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{Z}^{-}$$\xrightarrow[{{\text{elimination}}}]{{{k_e}}}\mathrm{CH}_{3} \mathrm{CH}= \mathrm{CH}_{2} +\mathrm{HZ}+\mathrm{Br}^{-}$

where 

$\mathrm{Z}^{-}=\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{O}^{-}(\mathrm{A})$ or $\begin{array}{*{20}{c}}
  {\,C{H_3}} \\ 
  {|\,\,\,\,\,} \\ 
  {C{H_3} - C - {O^ - }(B)} \\ 
  {|\,\,\,\,} \\ 
  {\,\,C{H_3}} 
\end{array}$

જો $\mathrm{k}_{\mathrm{s}}$ અને $\mathrm{k}_{\mathrm{e}}$ અનુક્રમે વિસ્થાપન અને વિલોપન માટેના વેગ અચળાંક હોય અને $\mu=\frac{\mathrm{k}_{\mathrm{s}}}{\mathrm{k}_{\mathrm{e}}}$ હોય, તો સાચો વિકલ્પ જણાવો.