Answer:
(a) \[\text{H}-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\overset{\overset{\text{O}}{\mathop{\text{
}\!\!|\!\!\text{ }\!\!|\!\!\text{
}}}\,}{\mathop{C}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}}\,-\text{H}\]
(b) \[\text{H}-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{ }\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{C}}\,=\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{C}}\,-\underset{\underset{\text{H}}{\mathop{\text{ }\!\!|\!\!\text{
}}}\,}{\overset{\overset{\text{H}}{\mathop{\text{ }\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}}\,-\text{H}\]
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