Select the correct orders

Co-ordination entity	Wavelength of light absorbed (run)
${\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_5\right]}^{2+}$	P
${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{H}}_2\mathrm{O}\right)\right]}^{3+}$	Q
${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$	R
${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3+}$	S
${\left[\mathrm{Cu}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]}^{2+}$	T

 

Crystal Field Splitting is inversely proportional to the Wavelength of light absorbed. Here, the correct order is given as,

${\left[\mathrm{Cu}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]}^{2+}$

${\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_5\right]}^{2+}$

${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{H}}_2\mathrm{O}\right)\right]}^{3+}$

${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$

${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3+}$

Thus, the correct options are B and C.