What is the IUPAC name of

1.	What is the IUPAC name of
Answer» 3-Ethyl-5-methyl-1-n-propylbenzene 3-Ethyl-5-propyltoluene 3-Ethyl-1-methyl-5-n-propylbenzene 1-Ethyl-3-methyl-5-n-propylbenzene ANSWER :D

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