Cis-Trans Isomerism in Cycloalkanes Constitutional isomers CH3 (different connections between atoms) CH3-CH-CH3 and CH3-CH2-CH2-CH3 Stereoisomers H3C CH3 H3C (same connections and but different three- dimensional geometry) CH3 LeingAlliRervd cis isomer trans isomer cis isomer trans isomer Cis-Trans Isomerism in Cycloalkanes