I don't know where to ask this question, but anyways, since it was asked in an exam, so finding out the correct answer afterwards is a moral responsibility as a homework. So here I am. My question is whether the compound 2-Hydroxy-5-nitrobenzaldehyde (Did I named correctly?) gives positive test with NaHCO3? I mean, will it give effervescence of CO2? [PLAIN]http://www.sigmaaldrich.com/medium/structureimages/37/mfcd00007337.png [Broken] All I know is 2,4-Dinitrophenol will give effervescence with NaHCO3 as H in OH becomes acidic. So the same phenomena will happen here on OH's H because of Nitro and aldehyde group?