Explanation
Nitrobenzene is soluble is benzene but in soluble in water .
Nitriles or organo cyanides have an alkyl (or aromatic group ) attached to a carbon triple-bond-nitrogen. The structure is R–C≡N, where R is alkyl group.
In aniline and Para nitro aniline lone pair of electrons are involved in delocalization with the benzene ring and loses their basic nature. Acetanilide has electron withdrawing carbonyl group and so less basic. In Benzylamine the lone pairs are readily available and hence strongly basic.
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