Arrange the carbanions, ${(C{H_3})_3}\overline C $, $\overline C C{l_3}$ , ${(C{H_3})_2}\overline C H$, ${C_6}{H_5}\overline C H{}_2$ in order of their decreasing stability :
${(C{H_3})_2}\overline C H$ > $\overline C C{l_3}$ > ${C_6}{H_5}\overline C H{}_2$ > ${(C{H_3})_3}\overline C $
$\overline C C{l_3}$ > ${C_6}{H_5}\overline C H{}_2$ > ${(C{H_3})_2}\overline C H$ > ${(C{H_3})_3}\overline C $
${(C{H_3})_3}\overline C $ > ${(C{H_3})_2}\overline C H$ > ${C_6}{H_5}\overline C H{}_2$ > $\overline C C{l_3}$
${C_6}{H_5}\overline C H{}_2$ > $\overline C C{l_3}$ > ${(C{H_3})_3}\overline C $ > ${(C{H_3})_2}\overline C H$
