MCQ
In $[Ag (CN)_2]^-$, the number of $\pi $ bonds is
- A$2$
- B$3$
- ✓$4$
- D$6$
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$(P)\, Fe(CO)_5\,\,\, (Q)\,CO\,\,\, (R)\, H_3B \leftarrow CO\,\,\,(S)\, [Mn(CO)_5]^-$