Write the structural formula of $\mathrm{o}$-toluidine. Name the reagent that reacts with nitromethane to form methyl hydroxylamine.

Find out the incorrect names and correct them. (a) N-butylaminoethane  (b) 1-amino 2-ethanol (c) methylaniline (d) propanediamine (e) 1-phenylaminoethane

Arrange the following in the decreasing order of basic strength in the gaseous phase. 

${\mathrm{NH}}_3, {\left({\mathrm{C}}_2{\mathrm{H}}_5\right)}_2\mathrm{NH}, {\left({\mathrm{C}}_2{\mathrm{H}}_5\right)}_3\mathrm{N}, {\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{NH}}_2$

Give the structure of $\mathrm{A}$ in the following reaction: