20. In the IUPAC name for the following compound, the -Br group is located on carbon number_? CH;CHCH-CH, Br a. 1 b. 2 с. 3 d. 4

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### Question 20

In the IUPAC name for the following compound, the -Br group is located on carbon number ___?

### Chemical Structure
- **Compound:** CH₃CHCH=CH₂
- **Substituent:** Br

### Options
- a. 1
- b. 2
- c. 3
- d. 4

### Explanation
The structure shows a linear chain of carbon atoms where:
- The first carbon is attached to CH₃ (methyl group).
- A Br (bromine) group is attached to the second carbon in the chain, which is single-bonded to two other carbon atoms.
- The compound appears to be a derivative of an alkene due to the presence of a double bond (CH=CH₂) between the third and fourth carbon atoms.

To determine the position of the bromine for IUPAC naming purposes, number the carbon chain from one end to the other, starting from the end nearest a substituent or functional group, such as the double bond. In this case, numbering from the right side ensures the double bond is on the first carbon, resulting in the bromine being on the third carbon: (3-bromo).

Identify the correct option for where the -Br group is located in IUPAC naming.
Transcribed Image Text:### Question 20 In the IUPAC name for the following compound, the -Br group is located on carbon number ___? ### Chemical Structure - **Compound:** CH₃CHCH=CH₂ - **Substituent:** Br ### Options - a. 1 - b. 2 - c. 3 - d. 4 ### Explanation The structure shows a linear chain of carbon atoms where: - The first carbon is attached to CH₃ (methyl group). - A Br (bromine) group is attached to the second carbon in the chain, which is single-bonded to two other carbon atoms. - The compound appears to be a derivative of an alkene due to the presence of a double bond (CH=CH₂) between the third and fourth carbon atoms. To determine the position of the bromine for IUPAC naming purposes, number the carbon chain from one end to the other, starting from the end nearest a substituent or functional group, such as the double bond. In this case, numbering from the right side ensures the double bond is on the first carbon, resulting in the bromine being on the third carbon: (3-bromo). Identify the correct option for where the -Br group is located in IUPAC naming.
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