Question Which of these compounds are amines? \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{NHCH}_{3} \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CONHCH}_{3} \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2} \left(\mathrm{CH}_{3}\right)_{2} \mathrm{NCH}_{2} \mathrm{CH}_{3}