Answer:
The general formula of
alkene \[={{C}_{n}}{{H}_{2n}}\]
\[\therefore \] \[12\times n+1\times
2n=70,\] or \[14n=70\] or\[n=70/14\,=5\].
The molecular formula of alkene
is \[{{C}_{5}}{{H}_{10}}\]. The possible structural isomers are:
(i) \[\underset{\text{Pent-1-ene}}{\mathop{\overset{5}{\mathop{C}}\,{{H}_{3}}-\overset{4}{\mathop{C}}\,{{H}_{2}}-\overset{3}{\mathop{C}}\,{{H}_{2}}-\overset{2}{\mathop{C}}\,H=\overset{1}{\mathop{C}}\,{{H}_{2}}}}\,\]
(ii) \[\underset{\text{Pent-2-ene}}{\mathop{\overset{5}{\mathop{C}}\,{{H}_{3}}-\overset{4}{\mathop{C}}\,{{H}_{2}}-\overset{3}{\mathop{C}}\,H=\overset{2}{\mathop{C}}\,H-\overset{1}{\mathop{C}}\,{{H}_{3}}}}\,\]
(iii)\[\underset{\begin{smallmatrix}
\\
\text{3-Methylbut-1-ene}
\end{smallmatrix}}{\mathop{\overset{4}{\mathop{C}}\,{{H}_{3}}-\overset{3}{\mathop{\underset{\begin{smallmatrix}
| \\
C{{H}_{3}}
\end{smallmatrix}}{\mathop{C}}\,}}\,H-\overset{2}{\mathop{C}}\,H=\overset{1}{\mathop{C}}\,{{H}_{2}}}}\,\]
(iv)\[\underset{\text{2-Methylbut-1-ene}}{\mathop{\overset{1}{\mathop{C}}\,{{H}_{2}}=\overset{2}{\mathop{\underset{\begin{smallmatrix}
| \\
C{{H}_{3}}
\end{smallmatrix}}{\mathop{C}}\,}}\,-\overset{3}{\mathop{C}}\,{{H}_{2}}-\overset{4}{\mathop{C}}\,{{H}_{3}}}}\,\]
(v)\[\underset{\begin{smallmatrix}
\\
\text{2-Methyl}\,\text{but-2-ene}
\end{smallmatrix}}{\mathop{\overset{1}{\mathop{C}}\,{{H}_{3}}-\overset{2}{\mathop{\underset{\begin{smallmatrix}
| \\
C{{H}_{3}}
\end{smallmatrix}}{\mathop{C}}\,}}\,=\overset{3}{\mathop{C}}\,H-\overset{4}{\mathop{C}}\,{{H}_{3}}}}\,\]
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