Chapter 3, Problem 9Q

You have an unknown with an observed melting point of ${\text{90}}^{\text{°}}{\text{C-93}}^{\text{°}}\text{C}\text{.}$

Is your unknown compound A with a reported melting point of $\text{95}{\text{.5}}^{\text{°}}{\text{C-96}}^{\text{°}}\text{C,}$ or compound B with a reported melting point of $\text{95}{\text{.5}}^{\text{°}}{\text{C-91}}^{\text{°}}\text{C?}$ Explain.