25. Draw structural representations of each of the following mol- ecules: (a) trans-1-chloro-2-ethylcyclopropane; (b) cis-1- bromo-2-chlorocyclopentane; (c) 2-chloro-1,1-diethylcyclopropane; (d) trans-2-bromo-3-chloro-1,1-diethylcyclopropane; (e) cis-1,3- dichloro-2,2-dimethylcyclobutane; (f) cis-2-chloro-1,1-difluoro- 3-methylcyclopentane.