Kemija - 2009./10. jesen - 19.

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

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

C. ${\mathrm{S}\mathrm{O}}_2\backslash mathrm\{SO\}\_\{2\}$

D. ${\mathrm{S}\mathrm{O}}_3\backslash mathrm\{SO\}\_\{3\}$