# Why is this molecule named 1,1-chloroiodoethane, rather than 1-chloro-1-iodoethane?

$\ce{CH3CHClI}$

If there is more than one substituent on a carbon, shouldn't they be named separately like 1-chloro-1-iodoethane?

• I'm pretty sure they should be named separately. Where have you seen that they should be listed together? Mar 30 '17 at 14:30
• On my teacher's online quiz, the program marked my answer as wrong and corrected it to 1,1-chloroiodoethane. Mar 30 '17 at 15:39
• I would ask your teacher about it. Even if the answer they gave is valid (which I'm not certain that it is formally correct), your answer should be valid as well. Mar 30 '17 at 15:54
• Pretty sure your teacher isn't following IUPAC standards. Mar 30 '17 at 16:22