MCQ
Which of the following metal ions will have maximum number of unpaired electrons
- A$F{e^{ + 2}}$
- B$C{O^{ + 2}}$
- C$N{i^{ + 2}}$
- ✓$M{n^{ + 2}}$

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[Given : mass of electron $=9.1 \times 10^{-31} \mathrm{~kg}$, Plank's constant $(\mathrm{h})=6.626 \times 10^{-34} \mathrm{JS}$ ]
(Value of $\pi=3.14$ )
$\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,} \\
{C{H_3} - C - CH - CH - CH - C{H_3}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,CHO\,\,}
\end{array}$
is :
Product $A$ is