In this example question, it says which of the following statements is incorrect about structural diversity of organic compounds. A carbon can form strong double and triple bonds. That's true. We can do that. Small atomic radius of carbon ensures sufficient orbital overlap to form strong bonds. So small atomic radius would lead to small or short bond length. We said that this is one of the key features that leads to structural diversity when it comes to carbon carbon bonds. So this is true.

Carbon conform stable chains up to 12 atoms. Only not once did we talk about there being a limit to the number of carbons we can have within the chain. So this statement here is not correct. So this would be our answer. Now if we look at D, organic compounds contain containing other elements such as oxygen, nitrogen or sulfur are very common. We've seen that when it comes to organic compounds, the key feature is a carbon carbon bond and a carbon hydrogen bond.

But we also know that our organic compounds can contain other elements such as oxygen, nitrogen, sulfur or the halogens. These are pretty common within nature and within labs. So here option D is correct. Including these other elements leads to greater structural diversity, so here option C would be our final answer.