Question

question
which iupac name is incorrect?
select the correct answer below:
1 - butanol
2 - butanol
3 - butanol
all of these names are possible.

Explanation:

According to IUPAC naming rules for alcohols, the parent chain is numbered from the end closest to the hydroxyl (-OH) group. For butanol (a 4 - carbon chain), the -OH group can be on carbon 1 or 2. If we try to number it as 3 - butanol, we can renumber the chain from the other end to get a lower number (1 - butanol in the reverse numbering). So 3 - butanol is an incorrect IUPAC name.

Answer:

3 - butanol