What is the common name of the given compound?

Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Picric acid
The compound is phenol with a nitro group at each of positions 2, 4 and 6: 2,4,6-trinitrophenol, which is its systematic name. Its common name is picric acid.
NCERT (2026-27 edition):
(i) Nitration – “With concentrated nitric acid, phenol is converted to 2,4,6-trinitrophenol. The product is commonly known as picric acid.”