Question

Which of the following compounds has a meridional isomer?

(a) [Fe(NO)5Br]^+

(b) [Al(CO)3(NO2)3]

(c) [K(NH)3)4(NO)2]^+

(d) [Fe(H2O)2(CO)2(NO)2]^3+

The question was posed to me in quiz.

The query is from Isomerism in Coordination Compounds topic in division Coordination Compounds of Chemistry – Class 12

Answer 1

Right answer is (b) [Al(CO)3(NO2)3]

The best I can explain: Fac-mer isomerism is only exhibited in octahedral coordination entities of the type [MA3B3] depending on the positions of the similar ligands.