B${(C{H_3})_2}CH.CH(N{H_2})COOH$
b
(b)${(C{H_3})_2}.\,CH.\mathop {\mathop {CH\,\,}\limits_{|\,\,\,\,\,\,\,\,} }\limits_{N{H_2}} - COOH$ $\rightleftharpoons $ ${{(C{{H}_{3}})}_{2}}-CH.\underset{N{{H}_{3}}^{+}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-CO{{O}^{-}}}}\,}}$