Which of the following indicates the presence of iodine in a chemical structure?

The presence of iodine in a chemical structure is indicated by the prefix "Iodo-". This prefix is derived from the element's name in Latin, "iodum," and is commonly used in organic chemistry to denote that an iodine atom is part of a larger molecular structure.

When analyzing organic compounds, prefixes are utilized to describe the specific halogen atom that is attached to the carbon backbone. "Iodo-" specifically emphasizes that iodine, with its unique properties and reactivity, is present as a substituent. Understanding these conventions is crucial in organic chemistry as it helps in identifying compounds and predicting their behavior in chemical reactions.

The other prefixes, such as "Chloro-", "Fluoro-", and "Bromo-", indicate the presence of chlorine, fluorine, and bromine, respectively. Each of these halogens has its own distinct prefix, which distinguishes them from one another in chemical nomenclature, but none of them designate iodine. Therefore, "Iodo-" is the only correct choice for indicating the presence of iodine in a chemical structure.