Kemija - 2009./10. jesen - 13.

A. ${\mathrm{H}\mathrm{C}\mathrm{O}\mathrm{O}}^{-}\backslash mathrm\{HCOO\}^\{-\}$

B. ${\mathrm{C}\mathrm{H}}_3{\mathrm{O}}^{-}\backslash mathrm\{CH\}\_\{3\}\; \backslash mathrm\{O\}^\{-\}$

C. ${\mathrm{H}\mathrm{C}\mathrm{O}}_3^{-}\backslash mathrm\{HCO\}\_\{3\}^\{-\}$

D. ${\mathrm{C}\mathrm{H}}_3{\mathrm{C}\mathrm{O}\mathrm{O}}^{-}\backslash mathrm\{CH\}\_\{3\}\; \backslash mathrm\{COO\}^\{-\}$