The incorrect order of electro negativities of d-block elements is  

A) Atomic size of Cu is smaller than zinc. Zn has stable $3d^{10} 4s^2$ config. But Cu has unstable $3d^{10} 4s^1$ config. So Cu will have more affinity towards electron. Thus EN of  $Cu>Zn$

B) Due to lanthanoid contraction atomic sizes of Ag & Au are almost equal but due to poor shielding effect of  f electrons Au has more effective nuclear charge thus having more electronegativity

 C) Atomic sizes of Co & Ni are almost equal. Thus their electro negativity are also equal

D) Mn has stable $3d^5 4s^2$ config. So it has less tendency to gain electron. Thus having least electro negativity.