Question

name the compound albr₃. aluminum tribromide aluminum(iii) bromide aluminum bromide monoaluminum tribromide

Explanation:

To name ionic compounds with metals that have a fixed oxidation state (like aluminum, which is +3 in most cases), we use the name of the metal followed by the name of the non - metal with an -ide suffix. We don't need to use prefixes (like mono -, tri -) for the metal or indicate the oxidation state with Roman numerals if the metal has only one common oxidation state. Aluminum has a common oxidation state of +3, so for $\ce{AlBr_3}$, we name it by taking the metal name (aluminum) and the non - metal (bromine) with the -ide suffix, resulting in aluminum bromide. The option "aluminum tribromide" uses an unnecessary prefix for the non - metal in the naming of ionic compounds of metals with fixed oxidation states. "aluminum(III) bromide" is not needed as aluminum's oxidation state is known and fixed here, and we don't use Roman numerals in this case. "monoaluminum tribromide" uses incorrect prefixes for the metal and non - metal in the naming of this type of ionic compound.

Answer:

C. aluminum bromide