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Old July 20th, 2005, 06:27
opuntia opuntia is offline
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ethyl would come first as dimethyl still represents the methyl group .
for example: CH3CH2CH(C2H5)C(CH3)(CH3)CH3
It has one ethyl group and two methyl groups and the IUPAC name for it is 3-ethyl-2,2-dimethylpentane.
Hope this helps