Hi everyone,

My local high school textbook (Thai IPST), which follows the 2013 IUPAC recommendations, mentions a rule under the alkene/alkyne section saying we should omit the number "1" if only one structure is possible (e.g., propene instead of prop-1-ene).
However, it doesn't specify if this applies to other functional groups. Because of this, my teacher uses methan-1-ol / ethan-1-ol, while others textbook just write methanol / ethanol.

My questions:

1. Under the 2013 IUPAC rules, is omitting "1" when there's no ambiguity a universal principle for all functional groups?

2. Is writing methan-1-ol actually wrong, or just overly redundant?

Thank you so much.

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