What is EAN of Co in $[\text{Co}(\text{NH}_3)_6]^{3+}$?

Identify the total number of complexes from following list having monodentate ligands in them
(a) Tetracyanonickelate (II) ion
(b) Potassium hexafluoroaluminate (III)
(c) Tetraamminecopper(II) ion
(d) Potassium trioxalatoaluminate (III)

Which of the following reactions is used for the preparation of alkyl fluorides from alkyl chlorides?

Which among the following is allylic halide?