Chapter 8, Problem 56QAP

Which of the following pairs of compounds have the same empirical formula?

etylene, ${\text{C}}_2{\text{H}}_2$ , and benzene, ${\text{C}}_6{\text{H}}_6$

hane, ${\text{C}}_2{\text{H}}_6$ , and butane, ${\text{C}}_4{\text{H}}_{10}$

trogen dioxide, ${\text{NO}}_2$ , and dinitrogen tetroxide, ${\text{N}}_2{\text{O}}_4$

phenyl ether, ${\text{C}}_{12}{\text{H}}_{10}\text{O}$ , and phenol, ${\text{C}}_6{\text{H}}_5\text{OH}$