The compound shown is compared with 4-nitrophenol and with phenol. Which order of acidity (decreasing from left to right) is correct?

In the compound shown, steric inhibition of resonance twists the nitro group out of plane, so it is a weaker acid than 4-nitrophenol. It is still a stronger acid than phenol, as the nitro group still withdraws by induction and some conjugation remains. Order: 4-nitrophenol (7.2) > compound shown (8.3) > phenol (10.0).