Give the formulas of the main products of the following reactions: (1) Dimethylamine and chlorhydric acid (2) Dimethylisopropylamine and bromhydric acid (3) N,N-dimethylpropan-1-amine and diluted nitric acid (4) N,3-dimethyl-N-ethylaniline and chloric acid (5) Dicyclohexylamine and iron(III) chloride (6) o-methylaniline and benzoyl chloride (7) Trimethylamine and 3-iodoethane (8) Propane-2-amine and methylpropanoic acid (heated)