The correct options are
A Acetic acid is the systematic name of vinegar
C O− | Me−C−OH is an unsaturated compound
D Prefixes like n-, iso, sec-, tert, neo-, etc., are used in IUPAC system
a.Acetic acid is the common name of vinegar.
b. It is a saturated compound since it does not have (C=C) or (C≡C) bonds.
c. All given prefixes are used in common name system.
d. The systematic names of acids are formed by dropping -e of the name of parent alkane and adding -oic acid. Hence, a,b,c are wrong and d is the only correct statement.