Which of the following $IUPAC$ names is incorrect?

What is the $IUPAC$ name of the given compound? $CH_2=CH-O-CHO$

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)
$(iv)$ $H_2C=CH-CH(OH)-CH_2-CH_2-CH_3$
$(v)$ $CH_3-C(CH_3)=C(Br)-CH_2OH$

The $IUPAC$ name of the compound shown in the image is:

Give the $IUPAC$ name of the following compound.

The $IUPAC$ name of $CH_3-CH(CH_3)-CO-COOH$ is