What is the IUPAC name for the molecule shown here?

Question

H      I
 \   /
  C=C
 /   \
I     H

M · Answer

THE H IS ATACHED TO ONE C ON TOP THEN H ON THE BOTTOM TO THE 2ND C SAME WITH I IT JUST GOT SCRWED UP BUT HELP

DrBob222 · Answer

This forum doesn't allow spaces. The spaces after the first space is ignored. I would name this cis-diiodoethene

M · Answer

what is the palce ment of the iodine on the carbons?

DrBob222 · Answer

I didn't know what to do with that so I didn't number them. They are cis-1,2-diiodoethene BUT cis IMPLIES they must be on different carbons. If we had 1,1-diiodoethene (we wouldn't name it 2,2-diiodoethene because 1,1 uses smaller numbers) there is no need for cis or trans. Bottom line is if both I groups are on the same C (either 1 or 2 carbon) cis/trans is not necessary. The ONLY reason cis/trans is necessary is when the I groups are on separate C atoms so I think there is no ambiguity. Having said all of that please know that I'm not an organic chemist and IUPAC has changed all of the naming rules long after I was in school. I have trouble remembering cis/trans vs E/Z

DrBob222 · Answer

I have no idea why I named this cis because the I atoms are on opposite side and it should be named trans. I just had cis on my mind when I typed it in and typed in cis--Sorry about that.