Assuming 1 as the 'Default' Number in Naming ketones and Omitting it while Naming the Compound
When naming aldehydes, the aldehyde functional group is numbered #1, and this number is not included when naming the aldehyde. For example, methanal:
It is possible for students to think that #1 is the default while numbering a functional group. So, when naming ketones, it is possible that they name a ketone without a number, assuming it is at 1 position. This is wrong.
- Do not assume that the position is #1 for ketone functional group.
- Secondly, always mention the number of the locant. Do not omit it by thinking that it is at #1 position and so the number is not required (unlike aldehydes).