CH₃ – CH₂ – CH₂ – CH₂ – CH₃	\[\begin{array}{l}C{H_3} - \mathop C\limits_\| H - C{H_2} - C{H_3}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}\end{array}\]	\[\begin{array}{l}\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}\\C{H_3} - \mathop C\limits_\|^\| - C{H_3}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}\end{array}\]
Pentane	2-methylbutane	2,2-dimethylpropane

a. Viết công thức cấu tạo của các alkane có tên gọi sau: Pentane; 2-methylbutane (isopentane) và 2,2-dimethylpropane (neopentane).