Oxirane is:

The $IUPAC$ name of $CH_3COCH(CH_3)_2$ is

Give the $IUPAC$ name of the following compound.

Which of the following is the correct $IUPAC$ name of the given organic compound $(X) \ ?$

Given below are two statements:
Statement $I$: $IUPAC$ name of $HO-CH_2-(CH_2)_3-CH_2-COCH_3$ is $7-$hydroxyheptan$-2-$one.
Statement $II$: $2-$oxoheptan$-7-$ol is the correct $IUPAC$ name for above compound.
In the light of the above statements,choose the most appropriate answer from the options given below:

The $IUPAC$ name of $CH_3-C(COOC_2H_5)=CH-CH_2-COOH$ is