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

In summary, the correct carbon numbering for (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene is determined by the Cahn-Ingold-Prelog priority rules, with the bromine being given the highest priority and the lowest possible number. The stereochemistry of this molecule is "Z" or "cis," with the highest priority substituents on the same side of the double bond. The physical properties of (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene include being a colorless liquid with a molecular weight of 211.83 g/mol and a melting point of -70°C. Its potential uses may include
  • #1
Sunwoo Bae
60
4
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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  • #2
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.
 

1. How do you determine the carbon numbering for (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene?

The carbon numbering for (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene is determined by following the IUPAC naming rules for organic compounds. The longest carbon chain is identified, and the substituents are then numbered in a way that gives them the lowest possible numbers. In this case, the longest carbon chain is 4 carbons, and the substituents are numbered in a way that gives them the lowest possible numbers: 1-bromo, 2-chloro, 2-fluoro, and 1-iodo.

2. What does the (Z) in (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene indicate?

The (Z) in (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene indicates that the molecule has a geometric isomerism, specifically a Z-isomer. This means that the substituents on the double bond are on the same side of the molecule.

3. Why is it important to properly number the carbons in (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene?

Properly numbering the carbons in (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene is important because it allows for the accurate and consistent communication of the structure of the molecule. This is essential in the fields of chemistry and biochemistry, where precise identification and understanding of chemical structures is crucial.

4. How do the substituents affect the properties of (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene?

The substituents in (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene can affect its properties in various ways. For example, the different halogen atoms (bromo, chloro, fluoro, and iodo) can have different electronegativities, which can affect the polarity of the molecule and its reactivity. Additionally, the positions of the substituents on the double bond can also influence the molecule's stability and reactivity.

5. Are there any other ways to name (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene?

Yes, there are other ways to name (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethene. For example, it can also be named as (Z)-1-bromo-2-chloro-2-fluoro-1-iodoethylene or (Z)-1-bromo-2-chloro-2-fluoro-1-iodo-1-ethene. However, the IUPAC naming system is the most widely accepted and consistent method for naming organic compounds.

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