12.9完成下列转化:-|||--N(H)_(2)-|||-a.-|||-NH2 NH2-|||-b. 1-|||-NO2-|||-C. (H)_(3)COOHarrow C(H)_(3)CON(H)_(2)-|||-d. (H)_(3)C(H)_(2)OHarrow C(H)_(3)CHC(H)_(2)C(H)_(3)-|||-NH2-|||-e -NHCOC(H)_(3)-|||-Br-|||--N(O)_(2)-|||-f. V=N- -NH2-|||-=N-square -C(H)_(3)-|||-g. .(H)_(3)- -OH