According to the IUPAC rules for polyfunctional compounds, which of the following functional groups — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

Nitro, Alkoxy, Nitroso, and Halo groups are strictly considered substituent groups in IUPAC nomenclature and only possess prefix names. The cyano group ($-CN$), however, has a high priority as a Principal Functional Group and possesses the suffix "nitrile" or "carbonitrile".