ઇથાઇન $\xrightarrow[\begin{smallmatrix} (2)\,\,excess\,I-\,C{{H}_{2}}\,-\,{{(C{{H}_{2}})}_{2}}-\,C{{H}_{3}} \\ (3)\,\,{{H}^{\oplus }} \end{smallmatrix}]{(1)\,\,excess\,NaN{{H}_{2}}}$