Which series of organic compounds shares the same empirical formula:

Explanation

The series of alkenes share the same empirical formula because they have a consistent ratio of elements. The empirical formula represents the simplest, most reduced ratio of the different elements present in a compound. In alkenes, the general molecular formula is (CnH2n), where n represents the number of carbon atoms. This formula indicates a fixed ratio of carbon to hydrogen, which is 1:2. As you move through the series of alkenes, such as ethene C2H4 propene C3H6, and butene C4H8, the ratio of carbon to hydrogen remains constant. This consistency in the ratio of elements leads to the alkenes in the series having the same empirical formula, which is CH2 for alkenes in general. It's important to note that while the empirical formula is the same, the molecular formulas of individual alkenes within the series differ based on the specific number of carbon atoms in each molecule. So option D is correct.