See explanation below.
Work Step by Step
1 Aromatic hydrocarbons follow Huckle 4n-pi rule and have pi electrons delocalised throughout their structure. The have alternate double bonds, which gives them a lot of stability. 2 Cycloalkanes do not have any double bonds, thus are saturated. The ratio of carbon to hydrogen is lesser in cycloalkanes than in aromatic compunds. Aromatic compounds are always planar and cyclic, while cycloalkanes are not planar.