The complex which does not exhibit geometrical isomerism is

Which of the following complexes exists as a pair of enantiomers?

Three complex compounds $I$,$II$ and $III$ have Blue,Red and Green colour respectively. Which of the following orders of $\lambda_{abs}$ (absorbed wavelength) is $CORRECT$?

Select the correct code of $TRUE$ and $FALSE$ for the given statements:
$(a)$ Peroxide ion as well as dioxygen molecule both are paramagnetic species.
$(b)$ In the set of isomers,$[Cr(H_2O)_6]Cl_3$ and $[CrCl(H_2O)_5]Cl_2 \cdot H_2O$,both compounds can easily lose water molecules on treatment with conc. $H_2SO_4$.
$(c)$ During the transformation $NO \to NO^+$,bond length decreases and magnetic behavior changes from paramagnetic to diamagnetic.
$(d)$ An ether is more volatile than an alcohol,both having the same molecular formula.

What is the spin-only magnetic moment of an element having one unpaired electron (in $BM$)?

$[Pt(NH_3)_4Cl_2]Br_2$ and $[Pt(NH_3)_4Br_2]Cl_2$ are examples of which type of isomerism?