free radical is formed which is \(s{p^2}\)-hybridized.
$(i)\,\,RC \equiv \mathop C\limits^ \ominus $
$(ii)\,\,[IMAGE]$
$(iii)\,\,{R_2}C = \mathop C\limits^ \ominus H$
$(iv)\,\,{R_3}C - \mathop C\limits^ \ominus {H_2}$
$[Nu^- = (1) PhO^- , (2) AcO^-, (3) HO^-, (4) CH_3O^-]$
$(A) \,\,CH_3-CH_2-NH_2$