Which of the following pairs share the same empirical formula?

Select one:

a. CH4 and C2H4

b. PbCl2 and PbCl4

c. N2O5 and NO2

d. C2H6 and C4H12

C2H6 and C4H12 share the same emperical formula of CH3 as the both compounds can be reduced by the smallest subscript in each compound. So C2H6 will be reduced by 2 making CH3 and C4H12 can be reduced by 4 making CH3