Kemija - 2019. ljeto, 18.

A. \(\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{H}_{2} \mathrm{O}+2 \mathrm{~e}^{-} \rightarrow \mathrm{CH}_{3} \mathrm{COOH}+2 \mathrm{~H}^{+}\)

B. \(\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CH}_{3} \mathrm{COOH}+2 \mathrm{~H}^{+}+2 \mathrm{~e}^{-}\)

C. \(\mathrm{MnO}_{4}^{-}+4 \mathrm{~H}^{+}+3 \mathrm{~e}^{-} \rightarrow \mathrm{MnO}_{2}+2 \mathrm{~H}_{2} \mathrm{O}\)  

D. ${\mathrm{M}\mathrm{n}\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}\to {\mathrm{M}\mathrm{n}\mathrm{O}}_4{}^{-}+4{\mathrm{H}}^{+}+3{\mathrm{e}}^{-}\backslash mathrm\{MnO\}\_\{2\}+2\; \backslash mathrm\{~H\}\_\{2\}\; \backslash mathrm\{O\}\; \backslash rightarrow\; \backslash mathrm\{MnO\}\_\{4\}\{\}^\{-\}+4\; \backslash mathrm\{~H\}^\{+\}+3\; \backslash mathrm\{~e\}^\{-\}$