Deciding Carbon Numbering for (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene

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Sunwoo Bae
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Homework Statement
Name the following structure.
Relevant Equations
none
1612538036611.png

The following structure was given, and the answer was (z)-1-bromo-2-chloro-2-fluoro-1-iodoethene.
But how do you decide which carbon is numbered 1 and the other 2?

Thank you.
 
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You take the carbon which is attached to the highest priority substituent. The highest priority substituent is the substituent with the highest atomic number. Since iodide has a greater atomic number than any of them, the rightmost carbon gets priority.