$C{H_3} - C{H_2} - C{H_2} - CN$ અને $C{H_3} - \mathop {CH}\limits_{\mathop |\limits_{CN} } \,\, - \,\,C{H_3}$
$\mathop { - CH{{(C{H_3})}_2}}\limits_1 \,\,\,\,\,\,\,\,\,\,\,\mathop { - C{H_2}C{H_2}Br}\limits_2 \,\,\,\,\,\,\,\,\,\,\mathop { - C{H_2}Br}\limits_3 \,\,\,\,\,\,\,\,\,\,\mathop { - C{{(C{H_3})}_3}}\limits_4 $
$I = II = III = IV$
$C{H_3} - C{H_2} - C{H_2} - CN$ અને $C{H_3} - \mathop {CH}\limits_{\mathop |\limits_{CN} } \,\, - \,\,C{H_3}$