Which statement is correct for the given compound?

What is the $IUPAC$ name of the compound $Cl-C(=O)-OC_2H_5$?

The correct decreasing order of priority for the functional groups of organic compounds in the $IUPAC$ system of nomenclature is:

Arrange the following in decreasing order of priority for functional groups of organic compounds:
$(a) -NH_2, -OH, -CN, >C=O, -C \equiv C, >C=C < $
$(b) >C=O, -CHO, -COCl, -COOH, -COOR, -CONH_2, -CN$
$(c) -SO_3H, -CN, -COR, -C \equiv C, >C=C < $

What is the $IUPAC$ name of the following compound?

For the organic compound $CH_3-CH_2-CH_2-CH_2-CH_2-CH_2-CH_3$,at which carbon atom should a substitution occur to make the compound chiral?