MCQ
Which of the following is paramagnetic?
  • A
    $[Fe(CN)_6]^{4-}$
  • B
    $[Ni(CO)_4]$
  • C
    $[Ni(CO)_4]^{2-}$
  • $[CoF_6]^{3-}$

Answer

Correct option: D.
$[CoF_6]^{3-}$
d

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$\begin{array}{*{20}{c}}
  \,\,\,{{C_2}{H_5}} \\ 
  {|\,\,\,\,\,\,\,} \\ 
  {C{H_3} - C - COOH} \\ 
  {|\,\,\,\,\,\,} \\ 
  \,\,\,{{C_3}{H_7}} 
\end{array}\xrightarrow{{{N_3}H/Conc.\,{H_2}S{O_4}}}\begin{array}{*{20}{c}}
 \,\,\,\,\,\,\,\,\,{{C_2}{H_5}} \\ 
  | \\ 
  {C{H_3} - C - N{H_2}} \\ 
  | \\ 
  \,\,\,\,\,\,\,\,\,{{C_3}{H_7}} 
\end{array}$

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