Kemija - 2010./11. jesen - 39.

A. $\mathrm{F}\mathrm{H}\mathrm{C}={\mathrm{C}\mathrm{F}}_2\backslash mathrm\{FHC\}=\backslash mathrm\{CF\}\_2$

B. ${\mathrm{C}\mathrm{l}}_2\mathrm{C}={\mathrm{C}\mathrm{C}\mathrm{l}}_2\backslash mathrm\{Cl\}\_2\; \backslash mathrm\{C\}=\backslash mathrm\{CCl\}\_2$

C. ${\mathrm{H}}_2\mathrm{C}=\mathrm{C}\mathrm{H}\mathrm{B}\mathrm{r}\backslash mathrm\{H\}\_2\; \backslash mathrm\{C\}=\backslash mathrm\{CHBr\}$

D. $\mathrm{B}\mathrm{r}\mathrm{H}\mathrm{C}=\mathrm{C}\mathrm{H}\mathrm{C}\mathrm{l}\backslash mathrm\{BrHC\}=\backslash mathrm\{CHCl\}$