A) \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}=\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}C{{H}_{3}}\]
B) \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,=CHC{{H}_{3}}\]
C) \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ O{{C}_{2}}{{H}_{5}} \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{2}}C{{H}_{3}}\]
D) \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ C{{H}_{2}}C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{2}}\]
Correct Answer: A
Solution :
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