Naming Aldehydes - Video Tutorials & Practice Problems
Get help from an AI Tutor
Ask a question to get started.
1
concept
Rules for Naming Aldehydes
Video duration:
54s
Play a video:
Now recall that aldehydes possess a carbon carbon connected to a H atom. Now, the set of rules for naming aldehydes are similar to ketones. The exception here though is that the carbon carbon of the aldehyde is always numbered one. So that's where we're gonna start numbering our longest carbon chain at the carbon carbon of the aldehyde here because we have an aldehyde, a new functional group. We're gonna have to modify our ending here. We're gonna modify the e ending of the original Alkane name to al because it's an aldehyde. In terms of our naming convention, we'd still have to give the locations of our substituents, the numerical locations. We'd have to check, give the parent name with its modified ending where we're changing E to L. So keep this in mind as we investigate all these different types of aldehydes.
2
example
Naming Aldehydes Example
Video duration:
2m
Play a video:
Provide a systematic name for the following aldehyde. Now, in order to do this, we're gonna utilize the following steps. Step one find the longest carbon chain which will represent the parent chain and assign name according to the prefixes and modifier. The parrot change should include the aldehyde group and greater number of carbons. If a tie between longest chains choose chain with more substituents. So here, if we take a look, we need to include our carbon carbon as part of the longest carbon chain. And remember in terms of numbering, we start numbering from that carbon. Our longest carbon chain would be here if we look, this is not part of the longest carbon chain because this is our branch group or our al Kel group, it's made up of two carbons. So this would be ethyl. So we've assigned name to all the substituents. Step three, start numbering the chain at the carbon of the aldehyde group. So this would be 12345 and six steps, 4 to 6, repeat steps from previous naming topics. If you haven't watched my video on Alcaine with substituents, I suggest that you go back and take a look because there we talk about steps 4 to 6 where we're basically paying attention to these substituents. We have to give the numerical locations of our substituents and make sure we name them alphabetically also gives us, how do we set up the name where we're using commas to separate numbers from each other and dashes to separate numbers from letters. So here we have an ethyl on carbon two. So it would be two ethyl because the aldehyde carbon is always going to be carbon number one. We don't need to designate where it's located. So here we have a six carbon chain which in Alcaine form is hexane. But remember we're changing the E to L so it becomes hex. And now, so the name of this particular aldehyde would be two ethyl Hexon. Now.
3
Problem
Problem
Provide the systematic name for the following aldehyde.
A
4-fluoro-5-methylheptanal
B
4-fluoro-5-ethylhexanal
C
4-fluoro-5-methylheptanone
D
4-fluoro-5-ethylhexanone
4
Problem
Problem
Which of the following compounds represent 2-bromo-pentanal?
A
B
C
D
Do you want more practice?
We have more practice problems on Naming Aldehydes