Three bottles a, b, and c have been found, each of which contains a liquid and is labeled \"amine c8h11n.\" as an expert in amine chemistry, you have been hired as a consultant and asked to identify each liquid. liquids a and b give off a gas when they react with nano2 and hcl at 0 °c; c does not. however, when the aqueous reaction mixture from the diazotization of c is warmed, a gas is evolved. liquid a is optically inactive, but when it reacts with ( )-tartaric acid, two isomeric salts with different physical properties are obtained. titration of c with aqueous hcl reveals that its conjugate acid has a pka = 5.1. oxidation of c with h2o2 (a reagent known to oxidize amino groups to nitro groups), followed by vigorous oxidation with kmno4 gives p-nitrobenzoic acid. oxidation of b in a similar manner yields 1,4-benzenedicarboxylic acid (terephthalic acid), and oxidation of a yields benzoic acid. identify compounds a, b, and c.