Identify the ionization isomer of $[\text{Cr}(\text{H}_2\text{O})_4\,\text{Cl}(\text{NO}_2)]\,\text{Cl}$ from the following.

The number of ligands which are directly bonded to the metal is known as

Identify the reagent used for replacement of $-\text{N}_2^+\text{Cl}^-$ from benzene diazonium chloride by iodine.

What is the product P obtained in following reaction?
$\text{CH}_3\text{CH}_2\text{Br} + \text{AgCN}_{(alc)} \rightarrow \text{P}$