(i) \(\mathop { - \mathop C\limits_|^| - \mathop C\limits^| = \mathop C\limits^| - \mathop C\limits_|^| - }\limits_{{\text{Trans - 2 butene (}}u = 0{\text{)}}} \)
(iv) \(\mathop {{C_2}{H_5}OH}\limits_{ + I} \)

$1.\,\,\,\begin{array}{*{20}{c}}
{C{H_3} - C - {O^ - }} \\
{\,\,\,||} \\
{\,\,\,O}
\end{array}$ $2.\,\,CH_3O^-$ $3.\,\,CN^-$
$\mathop {{H_3}C\mathop C\limits^ \ominus {H_2}}\limits_{(i)} \,,$$\mathop {{H_2}C = \mathop C\limits^ \ominus H}\limits_{(ii)} $ અને $\mathop {H - C \equiv \mathop C\limits^ \ominus }\limits_{(iii)} $

