Kemija - 2012./13. jesen - 9.

${\mathrm{C}\mathrm{H}}_4\backslash mathrm\{CH\}\_\{4\}$

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

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

${\mathrm{C}}_2{\mathrm{H}}_6\backslash mathrm\{C\}\_\{2\}\; \backslash mathrm\{H\}\_\{6\}$