p -Block elements - ll — Chemistry STD 12 Science — Question

$A$. The strength of anionic ligands can be explained by crystal field theory.

$B$. Valence bond theory does not give a quantitative interpretation of kinetic stability of coordination compounds.

$C$. The hybridization involved in formation of $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ complex is $\mathrm{dsp}^2$.

$D$. The number of possible isomer$(s)$ of cis- $\left[\mathrm{PtCl}_2(\text { en })_2\right]^{2+}$ is one

Choose the correct answer from the options given below:

$\begin{array}{*{20}{c}}
  {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - CH - C{H_3}(excess) + B{r_2}\xrightarrow{{hv}}} 
\end{array}$ $\mathop {\begin{array}{*{20}{c}}
  {\,\,\,\,\,C{H_3}} \\ 
  | \\ 
  {C{H_3} - C - C{H_3}} \\ 
  | \\ 
  {\,\,Br} 
\end{array}}\limits_{(A)} $   +   $\mathop {\begin{array}{*{20}{c}}
  {C{H_3}\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - CH - C{H_2} - Br} 
\end{array}}\limits_{(B)} $ 

the percentage yields of the products $(A)$ and $(B)$ are expected to be

${\left[\mathrm{V}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}, \quad\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}, \quad\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+},}$

${\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+},\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}}$

[Given atomic numbers: $\mathrm{V}=23, \mathrm{Cr}=24, \mathrm{Fe}=26$,

$\mathrm{Ni}=28, \mathrm{Cu}=29]$