IR Spectroscopy - Practice Problems
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- เผยแพร่เมื่อ 7 ก.พ. 2025
- This organic chemistry video tutorial on IR spectroscopy provides plenty of practice problems that help you to identify the functional groups that correspond to a particular IR spectrum.
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Hello,
I’m a Hong Kong student. It is sincerely appreciated that your video no matter is organic chemistry or physics. These videos totally save my college life. There is no words to express how much thankful am I.
Thanks for the video. The C=O stretch was a little off on the fourth problem @ 5:46 . I got confused for a moment ;)
Yuh, same
me too! i was like looking for which had a triple bond around 2200
okay good, im not going crazy, I was looking at my notes for like 3 mins like huh, then I settled for trick question, none of the above. and when he said C=O 1700 I instantly came to the comments lolol
@@joshuahering2041 on a real test, the professor would have to give you that one haha. You'd have good reason to pick none of the above; I think he just slipped a little when he was drawing that 1700 stretch.
@@vanessatravieso8775 nerds
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@@b-annm5571 YES I TOTALLY AGREE
Real organic spectro knowledge in simple way
Thanks
I'm a pharmacy student and there is no words express how much thankful l am , I'm really understand IR spectroscopy 😍
Not kidding I was doing my class lectures and text book to try and understand problems like these for 4 hours and was getting no where then I watched your two 10 min videos on IR spectroscopy and understand it. THANK YOU
Oh gawd allmaitee, I really needed this 18 months ago. You my dude, I trust your videos the most. It sucks that you didn't have the time to prep this before.
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Great content, however at 6:10 the signal is between 2000cm^-1 and 3000 cm^-1, you approximated it as 1700cm^-1.
The same mistake was made at 10:02 Great content! This really broke IR spectra interpretation for me.
That was a big error.
It also confused me.
This topic is too sensitive to make such blind mistakes
i was confused as well
At least I know I’m on the right track for noticing it .
I thought I was going insane
I made a 102% on my 2nd Ochem exam that was majority IR/NMR thanks to you!
mine is in 2 days omg
I am an Arab and I understood from you very well, your explanation is really great, thank you for the video, continue ❤
This made the new content we had to learn for Chem A level a lottt more easier! Thanks!!!
Very nice❤ I learn it very well, you teach better than our teacher😂 thank u🌼🌸
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i watched this very carefully and i understand now. thank you for making it easy to follow.
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For problem #4, can you clarify this. U said the peak was at 1700 however the peak was presented after 2000, roughly 2200. Is this a mistake. This confused me as I see you had the C=O in all the answers but the peak was not presented around 1600
It is a mistake
Yeah it's a mistake
I was also confused
I also caught that instantly. I guess we are learning pretty well if we are catching mistakes 👍😁
It is easier to understand with practice problems, thank you!
7:10 you put the carbonyl stretch at the wrong side of 2000.
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Thank you, this really helped I needed this for my test cause i'm in 6th grade. :D
Thank you for this video! I appreciate the breakdown of how to think about IR spectra!
Wow thanks I really needed this, You are great
In 1:37, the option D is in alkyne terminal end, why is the wavenumber not 3100-3200? He said 2200, that’s for an internal alkyne.
At 9:35 how does answer choice A have an Alkane stretch? Is it because there's a CH2 bond in between the NH2 and Benzene ring?
Oh wait, is it because the Alkane stretch is sp3?
My stupid brain understood this .. thank you soooooo much ❤️❤️
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at 6:20, I see the second curve as 2200 rather than 1700 C=O. Could you explain this? Thank you so much!
Glad i wasn’t the only one at 2200 this would be c triple bond c
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Good morning from India.
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It's very useful.. thanks . Then in the fourth problem there is no peak like carbonyl but u said like 1700 cm^-1.
Thank you so much for the phenomenal help you have been for me !! I do want to say though, at 6:10 you mentioned the signal at approx 2200 is a C=O stretch, how could this be so or is it that you were accidentally off on the graph? Pls clarify amazing tutor!
It was a slip up
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Thank you 😊
Thank you for this valuable video
7:17 that C=O stretch isnt at 1700 cm-1??
You've painted the C=O signal as in it was 2200-2300, not 1700 :(
Incredible explanation! Well done!
thank you! you've saved my life man!
we do appreciate.
Thank you
this really really helps me to understand tings that is not easy to understand just by reading. I am very grateful. do you feel the same way guys?
Thanks a lot, you are the best!
Im confused because my IR chart says an OH bond is between 3200 and 3500. Not at 3000
In my IR chart, we are given three options for OH bonds. When OH is present in an alcohol, phenols (dilute solutions), it is between 3590 and 3650. When OH is present in alcohol, phenols (hydrogen bonded) it is between 3200 and 3550. When OH is present in carboxylic acids (hydrogen bonded), it is between 2500 and 3000.
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Who else is having a CAT tomorrow and therefore to get some content here
thank you!
Nice and informative session..😊 Thank you Sir 🤗💝
Number four confused me I initially chose A but then I switched to be because it looked more like something was at 1300 than at 1700. I guess spotting errors helps learn too. Maybe that was his goal.
nice explanation sir,tnq
Im always doing that in my notebook thank you you help me
The ether expansion or concentration could fool the spectroscopy if not calibrate ether before measuring
Very intersting. How can we can compare two spectrum??????
Thanks for such a helpful video:)
@6:22 the stretch is of a nitrile functional group not carbonyl
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Really it's very helpful
I would like to thank you for making learning enjoyable for me.
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Wouldn't problem 5 be A because 2 peaks on the amine mean it is a primary amine? and answer D is a secondary amine.
Answer D is primary amine as nitrogen is directly attached to one single carbon and not 2. At first I also thought the same but then after looking at it carefully I realised it just looks so because of the ring it appears as if it's attached to 2 carbon but no just 1. It's been a year though!😂
Hello there!
Wonderful class
But I do have a question.
Please what is the name of that software you are using to write that!...... please
Great content ❤ Thank you so much
In Problem 4, how can the number after 2000 its about 2200 and you say that it's 1700, there is some thing wrong
i was going to say that i think thats a mistake on his part
Shouldn't 4 be an aldehyde?
Very nice videoss sir
What website does he use???
Very helpful 🙂
At no. 4, the signal was at >2000
But you said 1700cm^-1
yeah my professor doesnt do multiple choice for the test im about to have so hopefully i remember some of this lol.
please make a video about budans theorem
I did watch the "Introduction Video" but I'm failing to understand how do you know that which stretch is represented a certain functional group?
THANK YOU 😍😍😍👏
Can I know what kind of app you are using so I can use it too? Cause I need it for reporting please reply ༎ຶ‿༎ຶ
Hi I was inspired on how you make your lesson clear and presentable but may I ask what software do you use to illustrate your discussion because I will need it to my online class I hope that you reply to comment thank you.
OH or NH ?
hi sir, what online blackboard do you use?
At 7:21 i think it should be 2200 with C triple bond C so none of them are correct
but where is the ch2 bend on problem 2??
thank you very much
Please full topics of post pericyclic reactions..
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Thanks man
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How do you make these videos? Which app do u use?
Best one
May I know what app are you using sir?
Time signature of signature spectrum is better
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IR spectroscopy helps to determine percentage composition how??
In Q4, the frequency is beyond 2000... should be around 1700
Nice
very good
From the graph that carbonyl is not at 1700 (question 4).
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Thank admin
i can not understand anything. i think i have soo big problem on Organic chemistry. ( i watched IR Spectoscopy- basic introduction )
the goat
D in the first example... the geometry about the triple bond is not linear.... eeaurghrighghhhh
Where are you man, say something!!
100
Now build a time machine