Naming Cycloalkanes When two or more substituents could potentially receive the same numbers,number by alphabetical priority: CH3 CH3 1 CH2CH3 CH2CH3 3 5 2 NOT 3 1-Ethyl-2-methylcyclopentane 2-Ethyl-1-methylcyclopentane ▪ When two or more substituents could potentially receive the same numbers, number by alphabetical priority: Naming Cycloalkanes