અને  ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}\text{-}\underset{\underset{\text{O}}{\mathop{\text{ }\!\!|\!\!\text{  }\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}\,\text{-O-}\underset{\underset{\text{O}}{\mathop{\text{ }\!\!|\!\!\text{  }\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}\,\text{-}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}\text{ }\,\,\text{ }\!\!\And\!\!\text{ }\,\,\text{C}{{\text{H}}_{\text{3}}}-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-O-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-{{C}_{3}}{{H}_{7}}$

બંને યુગ્મ ચલરૂપક્તા દર્શાવે છે