MCQ
Correct statement for $3d-$ series is
- A$Sc$ shows stable $+ 3$ oxidation state
- B$Zn$ has maximum $I.E.$
- CMetallic radius of $Mn > Fe$
- ✓All are correct
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$\begin{array}{*{20}{c}}
{C{H_3} - C = CH - {C_6}{H_5}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ $\xrightarrow{{HBr\,/\,Peroxide}}'A'$
$\begin{array}{*{20}{c}}
{C{H_3} - C = CH - {C_6}{H_5}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ $\xrightarrow[{HBr}]{}'B'$
$(b)$ $CoCl _{3} \cdot 5 NH _{3}$
$(c)$ $CoCl _{3} \cdot 6 NH _{3}$ and
$(d)$ $CoCl \left( NO _{3}\right)_{2} \cdot 5 NH _{3}$
Number of complex(es) which will exist in cistrans is/are ....

| Reaction | Product | |
| $I$ | $RX + AgCN$ | $RNC$ |
| $II$ | $RX + KCN$ | $RCN$ |
| $III$ | $RX + KNO_2$ | (image) |
| $IV$ | $RX + AgNO_2$ | $R-O-N = O$ |
