There is no such thing as NH4Ci
NH4Cl (with a lowercase L) is ammonium chloride
Ammonuim Iodide.... becuz
NH4= Ammonuim and I= Iodine
since this is a binary compound the suffix in Iodine is dropped and the suffiz -ide is added resulting in Iodide.
ammonium chloride
Ammonium Chloride
Nh4C
Nonexistamine. If it did exist, the best name for it would probably be ammonium carbide, but that particular combination of atoms has loose bonds dangling ... it might theoretically exist as an ion or free radical, though a double or triple free radical (depending on exactly how the hydrogens are arranged) is massively unlikely. HCN and NH2CH3 are both real compounds called hydrogen cyanide (or cyanic acid) and aminomethane respectively.