Chemistry - Carbonyl compounds Question with Solution | TestHub

As in$\left[\mathrm{C}\mathrm{u}\right({\mathrm{H}}_2\mathrm{O}{)}_4{]}^{2+}$EAN is 35, so it does not follow EAN rule.
EAN$=$Atomic number of central atom + Number of electrons donated by ligands – oxidation state of central atom.
(A)$\left[\mathrm{P}\mathrm{t}\right(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{4+}$EAN$=78+2\times 6-4=86$
(B)$\left[\mathrm{F}\mathrm{e}\right(\mathrm{C}\mathrm{N}{)}_6{]}^{4-}$EAN$=26+1\times 6+4=36$
(C)$\left[\mathrm{Z}\mathrm{n}\right(\mathrm{N}{\mathrm{H}}_3{)}_4{]}^{2+}$EAN$=30+2\times 4-2=36$
(D)$\left[\mathrm{C}\mathrm{u}\right({\mathrm{H}}_2\mathrm{O}{)}_4{]}^{2+}$EAN$=29+2\times 4-2=35$