The complex used as an anticancer agent is

$PCl_5$ reacts with finely divided silver on heating and a white silver salt is obtained,which dissolves on adding excess aqueous $NH_3$ solution. Write the reactions involved to explain what happens.

Match List-$I$ with List-$II$:

$A$. Haber process	$I$. Fe catalyst
$B$. Wacker oxidation	$II$. $PdCl_2$
$C$. Wilkinson catalyst	$III$. $[(PPh_3)_3RhCl]$
$D$. Ziegler catalyst	$IV$. $TiCl_4$ with $Al(CH_3)_3$

Choose the correct answer from the options given below:

Identify $(A)$ to $(E)$ and also explain the reactions involved.
$CuCO_3 \to CuO$ $\xrightarrow{\text{Heat with } CuS} (A)$ $\xrightarrow{\text{conc. } HNO_3} (B)$ $\xrightarrow{NH_{3(aq)}} (C) \text{ (Blue solution)}$
$CuCO_3 \to (D)$ $\xrightarrow{Ca(OH)_2} (E) \text{ (Milky)}$ $\xrightarrow{CO_2} Ca(HCO_3)_2 \text{ (Clear solution)}$

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$K_3[Fe(CN)_6] + FeCl_3 \longrightarrow Fe[Fe(CN)_6] \downarrow$

The metals present in insulin and haemoglobin are respectively: