The analgesic drug ibuprofen `(A)` is chiral and exists in (+) and (-) froms. One enantiomer is physiologically active, while the other is inactive. The other is inactive. The structure of ibuprofen is given below.
The `IUPAC` name of `(A)` is:
A. 3-(p-Isobuty1 pheny1) propanic acid
B. 2-(p-Isobuty1 pheny1) propanic acid
C. 3-(p-sec-Buty1 pheny1) propanic acid
D. 2-(p-sec-Buty1 pheny1) propanic acid