MCQ
Finely divided iron combines with $CO $ to give
- ✓$Fe{(CO)_5}$
- B$F{e_2}{(CO)_9}$
- C$F{e_2}{(CO)_{12}}$
- D$Fe{(CO)_6}$
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the number of sigma and pi bonds respectively are

$(1)$ $\frac{3}{2} O _2( g ) \rightarrow O _3$ $(g)$
$(2)$ $\frac{1}{8} S _8( s )+ O _2( g ) \rightarrow SO _2( g )$
$(3)$ $2 H _2( g )+ O _2( g ) \rightarrow 2 H _2 O (l)$
$(4)$ $2 C ( g )+3 H _2( g ) \rightarrow C _2 H _6( g )$