So, \(\left(3 \times 2 e ^{-}=6 e ^{-}\right) ; 2\) \(NO\) can easily replaced \(3 CO\).
\(\left(6 \times 2 e ^{-}=12 e ^{-}\right) ; 4 NO\) can easily replace \(6 CO\)
\(Fe ( CO )_{5} \rightarrow Fe ( NO )_{2}( CO )_{2}\)
\(Cr ( CO )_{5} \rightarrow Cr ( NO )_{4}\)
પરમાણુ ભાર : $Mn = 25,\,Fe = 26,\,Co = 27,\,Ni = 28$