Fac, mer isomerism is associated with which of the following general formula ?

Fac-Mer isomerism is associated with which of the following types of complexes ? (M is the central metal. A-A is a symmetrical bidentate ligand. A,B,C & D are monodentate ligands)

Which of the following is the general formula of amines?

Which of the following is the general formula of a soap ?

Fac-mer isomerism is shown by