MCQ
The valence shell electronic configuration of $C{r^{2 + }}$ ion is
- ✓$4{s^o}3{d^4}$
- B$4{s^2}3{d^2}$
- C$4{s^2}3{d^0}$
- D$3{p^6}4{s^2}$
$Cr \to [Ar]\,3{d^5}4{s^1}$
$C{r^{2 + }} \to [Ar]3{d^4}4{s^0}$.
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$RCOOAg \xrightarrow{{B{r_2}/\Delta }} R-Br$
which one of the following acid will give maximum yield of $R-Br$ in the above reaction?
$[(\eta^5 - C_5H_5) Fe(CO)_2Cl]$ is