A) \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,\underset{C{{H}_{3}}}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,-C{{H}_{3}}=\]
B) \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{\mathbf{|}}{\mathop{CH}}\,}}\,-\overset{C{{H}_{3}}}{\mathop{\overset{\mathbf{|}}{\mathop{C}}\,}}\,=C{{H}_{2}}\]
C) \[C{{H}_{2}}=\underset{C{{H}_{3}}}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,-\underset{C{{H}_{3}}}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,=C{{H}_{2}}\]
D) \[C{{H}_{3}}-C{{H}_{2}}-\overset{C{{H}_{3}}}{\mathop{\overset{\mathbf{|}}{\mathop{C}}\,}}\,=C{{H}_{2}}\]
Correct Answer: A
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