Naming BrCH2CH2CH2OH: Excluding Carbon # for OH Group

In summary, the correct name for BrCH2CH2CH2OH is 2-bromo-1-propanol. To determine the name of a compound with an OH group, you must identify the longest carbon chain containing the OH group, determine its position and assign a prefix, and add the suffix -ol. The carbon number for the OH group is excluded because it is already accounted for in the prefix. The naming process for compounds with multiple OH groups follows the same steps, but the prefix and suffix will indicate the number of OH groups. There are exceptions to the naming rules, such as when the OH group is attached to a cycloalkane or a double/triple bond.
  • #1
Sunwoo Bae
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Homework Statement
Name BRCH2CH2CH2OH by the IUPAC system
Relevant Equations
none
I thought that the compound would be named 2-bromo-propan-1-ol, but the answer sheet says that it is 3-bromopropanol.
But don't you have to indicate the position of the OH group with carbon numbers?

My textbook says that CH3CH2CH2OH would be named 1-propanol. Here, it seems like the position of the OH group was indicated.

Then on what instances can the numbers for OH be excluded?

Thank you.
 
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  • #2
IUPAC always indicates the position of the alcohol. You are both wrong but not by much!
3-Bromo-propan-1-ol
 

1. What is the chemical name for BrCH2CH2CH2OH?

The chemical name for BrCH2CH2CH2OH is 2-bromo-1-propanol.

2. How do you determine the name of a compound with a functional group?

To determine the name of a compound with a functional group, you must first identify the functional group present. In this case, the functional group is an OH group. Then, you must count the number of carbon atoms in the longest carbon chain that includes the functional group. In this case, there are three carbon atoms. Finally, you must arrange the name in alphabetical order, with the functional group as the suffix. In this case, the suffix is -ol for an alcohol.

3. Why is the carbon number for the OH group excluded in the name?

The carbon number for the OH group is excluded in the name because it is already accounted for in the longest carbon chain. In this case, the OH group is attached to the third carbon atom, so it is not necessary to include it in the name.

4. Can the order of the carbon atoms be changed in the name?

No, the order of the carbon atoms cannot be changed in the name. The longest carbon chain must be numbered starting from the end closest to the functional group, and the functional group must be assigned the lowest possible number.

5. Are there any other rules for naming compounds with functional groups?

Yes, there are other rules for naming compounds with functional groups. These include indicating the stereochemistry of the molecule, using prefixes to indicate the number of functional groups, and using prefixes to indicate the presence of multiple identical functional groups. It is important to follow all of these rules to accurately name a compound.

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