Provide the $IUPAC$ name of the compound: $CH_3-CH(OH)-CH_2-CH_2-CH_2-C(Br)_2-CH_3$

The $IUPAC$ name of $H_3C-CH(C_2H_5)-CH_2-CH(OH)-CH_2Cl$ is

The $IUPAC$ name of succinic acid is:

The $IUPAC$ name of $NC-CH_2-CH_2-COOH$ is

According to $IUPAC$ nomenclature,is the name $5-(2'-ethylbutyl)-3,3-dimethyldecane$ correct for the given structure? Explain why or why not.

Fill in the blanks:
$(1)$ The $IUPAC$ name of $CH_3COCH_2CH_2CH_2COOH$ is .........
$(2)$ The formula of pent$-4-$en$-2-$ol is .........
$(3)$ The $IUPAC$ name of the following structure is ......... and ......... is the main functional group in it.
(Structure: $A$ cyclohexene ring with an $-OH$ group attached to the carbon adjacent to the double bond,such that the double bond is between carbons $2$ and $3$ relative to the $-OH$ at position $1$.)
$(4)$ For $CH_3CH(OH)CH_2CH_2CH_2CHO$,the main functional group and the second priority group are ......... and ......... respectively.