The $IUPAC$ name of $HOOC-CH=CH-COOH$ is

For each of the following compounds,write a condensed formula and also their bond-line formula.
$(a)$ $HOCH_{2}CH_{2}CH_{2}CH(CH_{3})CH(CH_{3})CH_{3}$
$(b)$ $N \equiv C-CH(OH)-C \equiv N$

Provide the $IUPAC$ name for the following compound:
$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,H\,\,\,\,\,{C_4}{H_9}} \\
{\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,|} \\
{CH_3CH_2 - C - C - CH_3} \\
{\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,|} \\
{\,\,\,\,\,\,\,\,\,CH_3\,\,\,\,CH_3}
\end{array}$

The $IUPAC$ name of isoprene is:

The $IUPAC$ name of $CH_3-CH(OH)-CH_2-CH(CH_3)-CHO$ is:

How many chiral carbon atoms are present in $2\text{-Iodo-}3,4,5\text{-trimethylhexane}$?