b
\(o\)-nitrophenol and \(p\)-nitrophenol can be separated by steam distillation. In \(p\)-nitrophenol, there is intermolecular \(H\) bonding because it doesn't form intramolecular \(H\) bonding due to presence of a group at opposite sides of benzene which cannot be easily steam distilled while \(o\)-nitrophenol has strong intramolecular hydrogen bonding as \(NO _2\) and \(OH\) form \(H\) bonding. Ortho nitro-phenol is steam volatile(intramolecular hydrogen bonding) whereas \(p\)-nitrophenol is least steam volatile when compared to the ortho nitro-phenol due to intermolecular hydrogen bonding.