Name the following compound according to IUPAC?

Q. IUPAC name of the compound $CN\mid C{H}_3-C-C{H}_2-C-C{H}_3\mid \mid \mid OC{H}_3$ is:

Q. The coordination number of $N{i}^{2+}$ is $4$.
$NiC{l}_2+KCN\left(excess\right)\to A\left(cyanocomplex\right)$
$NiC{l}_2+conc.HCl\left(excess\right)\to B\left(Chlorocomplex\right)$

The IUPAC name of A and B are

Q. The correct name of the compound $\left[Cu\right(N{H}_3{)}_4\left]\right(N{O}_3{)}_2$ according to IUPAC system is:

Q. $1)$ Write the $\text{IUPAC}$ names of the following coordination compounds:
$A)$ $\left[Pt\right(N{H}_3{)}_{2}Cl\left(N{O}_2\right)]$

$2)$ Write the $\text{IUPAC}$ names of the following coordination compounds:
$B)$ $K_3\left[Cr\right(C_2{O}_4{)}_3]$

$3)$ Write the $\text{IUPAC}$ names of the following coordination compounds:
$C)$ $\left[CoC{l}_2\right(en{)}_2]Cl$

$4)$ Write the $\text{IUPAC}$ names of the following coordination compounds:
$D)$ $\left[Co\right(N{H}_3{)}_5\left(C{O}_3\right)]Cl$

$5)$ Write the $\text{IUPAC}$ names of the following coordination compounds:
$E)$ $Hg\left[Co\right(SCN{)}_4]$

Q. A compound named 5-(-1-Cyanoethyl)-2-methyl hexanoic acid has something wrong according to IUPAC. What is correct IUPAC name?