Which of the following amines can be resolved into enantiomers? Justify your answer for each case.
(i) trans-2-ethylcyclopentanamine
(ii) N-ethyl-N-isopropylaniline
(iii) 1-methylpyrrolidine
(iv) N-isopropyl-N-methylcyclohexanaminium chloride
(v) N-ethyl-N-isopropyl-N-propylbutan-1-aminium chloride