question_answer

Which of the following compounds will show geometrical isomerism [IIT-JEE 1998]

A) 2-butene

B) Propene

C) 1-phenylpropene

D) 2-methyl-2-butene

Correct Answer: A

Solution :

  2-butene   \[\underset{\text{(cis)}}{\mathop{\begin{matrix}    \begin{matrix}    \,  \\    C{{H}_{3}}-\underset{|}{\mathop{C}}\,=\underset{|}{\mathop{C}}\,-{{C}_{6}}{{H}_{5}}  \\ \end{matrix}  \\    H\,\,\,\,\,H  \\ \end{matrix}}}\,\]  and \[\underset{\text{(Trans)}}{\mathop{C{{H}_{3}}-\underset{H\,\,}{\mathop{\underset{/\,\,}{\mathop{C}}\,}}\,=\overset{\,\,\,H}{\mathop{\overset{\,\,\,\,/\,\,}{\mathop{C}}\,}}\,-{{C}_{6}}{{H}_{5}}}}\,\]