Select correct code about complex $\left[\mathrm{Cr}\left({\mathrm{NO}}_2\right){\left({\mathrm{NH}}_3\right)}_5\right]\left[{\mathrm{ZnCl}}_4\right]$.

(P) IUPAC name of the compound is Pentaammine Nitrito-N-chromium (ill) tetrachloridozincate (II)

(Q) It shows geometrical isomerism 

(R) It shows linkage isomerism 

(S) It shows co-ordination isomerism

Pentaammine Nitrito-N-chromium (III) tetrachlorozincate is the IUPAC name for the compound [Cr (NO) (II). N denotes that the nitro group is connected to the metal atom via the N atom.

Because nitro ligand is an ambidentate ligand with two donor atoms, linkage isomerism is possible.

It possesses coordination isomers. The coordination isomers are as follows:

$\left[\mathrm{CrCl}{\left({\mathrm{NH}}_3\right)}_5\right]\left[{\mathrm{ZnCl}}_3\left({\mathrm{NO}}_2\right)\right],\left[{\mathrm{CrCl}}_2{\left({\mathrm{NH}}_3\right)}_4\right]\left[{\mathrm{ZnCl}}_2\left({\mathrm{NO}}_2\right){\mathrm{NH}}_3\right]$ and $\left[\mathrm{Zn}\left({\mathrm{NO}}_2\right)\left({\mathrm{NH}}_3\right)\right]$.

So, option B is correct answer.