Kemija - 2010./11. ljeto - 35.

A. ${\mathrm{C}\mathrm{N}}^{-}\mathrm{i}\mathrm{H}\mathrm{C}\mathrm{N}\backslash mathrm\{CN\}^\{-\}\; ~\backslash mathrm\{i\}\; ~\backslash mathrm\{HCN\}$

B. $\mathrm{H}\mathrm{C}\mathrm{N}\mathrm{i}\mathrm{O}\mathrm{H}{}^{-}\backslash mathrm\{HCN\}\; \backslash mathrm\{~i\}\; \backslash mathrm\{~OH\}\{\; \}^\{-\}$

C. ${\mathrm{C}\mathrm{N}}^{-}\mathrm{i}\mathrm{O}\mathrm{H}{}^{-}\backslash mathrm\{CN\}^\{-\}\; \backslash mathrm\{~i\}\; \backslash mathrm\{~OH\}\{\; \}^\{-\}$

D. ${\mathrm{H}}_2\mathrm{O}\mathrm{i}\mathrm{H}\mathrm{C}\mathrm{N}\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{O\}\; ~\backslash mathrm\{i\}\; ~\backslash mathrm\{HCN\}$