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Answer
a
$\mathop {C{H_3}C{H_2}C{H_2}C{H_2}C{H_3}}\limits_{n\, - \,pentane} $ $\mathop {\begin{array}{*{20}{c}}
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}CHC{H_2}C{H_3}}
\end{array}}\limits_{isopentane} $ $\mathop {\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{\,\,\,\,C{H_3}} \\
|
\end{array}} \\
{{H_3}CCC{H_3}} \\
| \\
{\,\,\,\,\,\,\,C{H_3}}
\end{array}}\limits_{neopentane} $
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