Among the reactions given below for ${\mathrm{B}}_2{\mathrm{H}}_6$, the one which does not take place is

Reaction between diborane and alkene are carried out in dry ether under an atmosphere of ${\mathrm{N}}_2$ because ${\mathrm{B}}_2{\mathrm{H}}_6$ and the products are very reactive. The products further treated with alkaline ${\mathrm{H}}_2{\mathrm{O}}_2$ to convert into alcohols.

${\mathrm{B}}_2{\mathrm{H}}_6+6{\mathrm{C}}_2{\mathrm{H}}_4⟶\mathrm{B}\underset{\mathrm{reactive}}{{\left({\mathrm{C}}_2{\mathrm{H}}_4\right)}_3}\frac{\text{ alkaline }}{{\mathrm{H}}_2{\mathrm{O}}_2}$ $3{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}+{\mathrm{H}}_3{\mathrm{BO}}_3$