Question

All of these alkanes, except cyclohexane, have the same chemical formula. Why, then, are these three different compounds?

Answer 1

Answer:

Because these three have different arrangements of  $-CH_{3}$

Explanation:

All of these alkanes: $C_{5} H_{12}$ Pentane, Isopentane, and Neopentane despite being homologous have the same chemical formula and their bonding rearranged, with branches of $-CH_{3}$ differently placed what gives them different physical and chemical properties such as melting and boiling points different.