Which of the following compounds is ionic?

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Let's evaluate each compound in terms of bonding nature and typical classifications.
Option 1: CO (carbon monoxide). This molecule is predominantly covalent, with a polar covalent bond between carbon and oxygen and no significant ionic character in the solid state. It does not form discrete ions in a lattice.
Option 2: SeCl2 (selenium dichloride). This is a covalent compound formed from a nonmetal (selenium) and a nonmetal (chlorine). It does not consist of ions held together in an ionic lattice.
Option 3: ICl3 (iodine trichloride). Also a covalent compound, since iodine and chlorine are nonmetals and share electrons rather than forming ions in a lattice structure.
Option 4: NH4NO3 (ammonium nitrate). This compound consists of the ammonium cation (NH4+) and the nitrate anion (NO3−) arranged in an ionic lattice, typical of salts formed from a metal or polyatomic ion pairing with a counterion. The constituent ions arise from ionization and electrostatic attraction, which is the hallmark of ionic compounds.
Option 5: PF3 (phosphorus trifluoride). A covalent molecule with P–F bonds and no ionic lattice formation between ions.
In summary, all of the options except NH4NO3 are covalent in character and do not form a crystal lattice of ions. NH4NO3, by contrast, is composed of ions (NH4+ and NO3−) and is a classic ionic compound.

Which of the following compounds is ionic?

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