On this question, you might notice an added complication because I threw in what we called earlier a complex carbonyl. Remember I told you guys how complex carbonyls are the ones that are not just going to result in one area, they're going to result in 2. And we need to be able to identify that. First of all, let's go with the easy ones here. We can get rid of our C-C single bond. We know that there's going to be an sp3 CH bond. That would be just quickly identifying it. That would be like a hydrogen right there. That would be sp3 c h. But now we get to the part of the complex carbonyl. So 3, let's just talk about first of all the C double bond O. Where is that going to result? Now keep in mind, C double bond O is a carbonyl, so that means that it could result remember we have a big range for our carbonyl region. I said it was something like 1680 all the way up to 1840, so pretty big range there. But specifically because this is an aldehyde, because of corn, where would you expect to find it? Remember that an aldehyde would count as the R in corn because it could either be aldehyde or ketone R or H. That would result at 1710. Okay. So we've got the frequency for the aldehyde, but what else do we have to worry about? The CH bond because it's a complex carbonyl, so we're also going to have a bond to H to worry about. Specifically, the aldehyde H gets its own unique peak and that's going to be at 2700.
Hopefully, I'm not in the way there. You can see what I'm writing here. We've got the complex carbonyl with 2 different peaks. Just as a pop quiz, what's the other complex carbonyl that we're going to worry about in this course? Carboxylic acid because carboxylic acid also has a peak in the carbonyl region and has a very broad peak in the hydrogen region. So guys, that's it for this practice problem. I think you guys got the picture of what you need to do now. You're doing great. Let's move on to the next topic.