Kemija - 2022./23. probna - 19.

$\mathrm{C}\mathrm{O}\backslash mathrm\{CO\}$

${\mathrm{C}\mathrm{O}}_2\backslash mathrm\{CO\}\_\{2\}$

${\mathrm{C}}_2{\mathrm{H}}_2\backslash mathrm\{C\}\_\{2\}\; \backslash mathrm\{H\}\_\{2\}$

${\mathrm{C}}_2{\mathrm{H}}_4\backslash mathrm\{C\}\_\{2\}\; \backslash mathrm\{H\}\_\{4\}$