Answer:
(a)
(b) \[\text{H}-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}}\,-\text{H}\]
(c) \[H-C\equiv
C-\underset{\underset{\text{H}}{\mathop{\text{ }\!\!|\!\!\text{
}}}\,}{\overset{\overset{\text{H}}{\mathop{\text{ }\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{OH}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{
}}}\,}{\mathop{\text{C}}}}\,-\underset{\underset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\overset{\overset{\text{H}}{\mathop{\text{
}\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}}\,-\text{H}\]
(d)
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