What is the correct $IUPAC$ name of the given compound?
$HOOC-CH_2-C(OH)(COOH)-CH_2-COOH$

Give rules of nomenclature of organic compounds containing one or more functional groups.

What is the $IUPAC$ name of the compound $CH_3-CH_2-CH_2-C(CH_3)_2-CH_3$?

Select the correct $IUPAC$ name of pyrogallol.

Match the structures given in Column-$I$ with their $\text{IUPAC}$ names in Column-$II$.
| Column-$I$ (Structure) | Column-$II$ ($\text{IUPAC}$ Name) |
| :--- | :--- |
| $(A)$ Cyclohexanol | $(i)$ $2$-ethoxy-$1,1$-dimethylcyclohexane |
| $(B)$ $2$-methylcyclopentanol | (ii) $3$-methylphenol |
| $(C)$ $3$-methylphenol | (iii) Trihydroxybenzene |
| $(D)$ $1$-ethoxy-$2,2$-dimethylcyclohexane | (iv) $2$-methylcyclopentanol |
| $(E)$ Benzene-$1,2,4$-triol | $(v)$ Cyclohexanol |
| | (vi) Benzene-$1,2,4$-triol |

The $IUPAC$ name of $CH_3-CH(CH_3)-C(=O)-C(=O)-NHBr$ is