The $IUPAC$ name of $CH_3CH_2COCl$ is

Name the following compounds according to the $IUPAC$ system:
$(i)$ $CH_3-CH(CH_2Cl)-CH(CH_2OH)-CH(CH_3)-CH_3$
$(ii)$ $CH_3-CH(CH_3)-CH_2-CH(OH)-CH(CH_2OH)-CH_3$
$(iii)$ $3-$Bromocyclohexanol (structure implied)
$(iv)$ $H_2C=CH-CH(OH)-CH_2-CH_2-CH_3$
$(v)$ $CH_3-C(CH_3)=C(Br)-CH_2OH$

Fill in the blanks:
$(1)$ The $IUPAC$ names of $CH_3COOCH_3$ and $CH_3CH_2COOCH_3$ are ....... and ....... respectively.
$(2)$ ....... isomers of dibromobenzene exist.
$(3)$ ........ is the $IUPAC$ name and ........... is the common name of $C_6H_5OCH_3$ respectively.
$(4)$ The structure of $1-$chloro$-2,4-$dinitrobenzene is shown below.

Write bond line formulas for: Isopropyl alcohol,$2,3-$Dimethylbutanal,Heptan$-4-$one.

The $IUPAC$ name of the following compound is

What is the correct structure of $4$-bromo-$3$-methylbut-$1$-ene?