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H NMR Spectroscopy Review - Examples & Multiple Choice Practice Problems

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This organic chemistry video provides a review of H NMR spectroscopy. It provides plenty of examples and multiple choice practice problems that you might encounter on your next test or exam. It discusses chemical shifts for common functional groups such as aldehydes, carboxylic acids, ethers, alkyl halides, and aromatic benzene rings. It provides a review of the H NMR signals and the spin spin splitting pattern of the n+1 rule that you need to know. It also shows you how to determine the number of signals in an h nmr spectrum and discusses the terms upfield and downfield so you can understand it.
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Here is a list of topics:
1. Common Chemical Shifts / H NMR Table Values
2. How To Find The Number of Signals
3. N + 1 rule - Spin Spin Splitting
4. How To Identify Identical Hydrogen Atoms
5. How To Draw a HMR Signals /Spectrum
6. Upfield vs Downfield
7. H-NMR Analysis and Integration
Disclaimer: Some of the links associated with this video may generate affiliate commissions on my behalf. As an amazon associate, I earn from qualifying purchases that you may make through such affiliate links.

Опубликовано:

22 авг 2024

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Комментарии : 151

@TheOrganicChemistryTutor 7 месяцев назад

Organic Chemistry PDF Worksheets: www.video-tutor.net/orgo-chem.html Full-Length Exams and Worksheets: www.patreon.com/MathScienceTutor/collections

@frost343434 5 лет назад

Might as well be giving you my tuition money… doing a better job then my teacher. Thanks for this!

@saadmmcsoud1596 5 лет назад

same here

@alkhan5445 3 года назад

Than

@Mariiiam 2 года назад

Patreon it is then

@alexanderechevarria93 5 лет назад

Super helpful on H-NMR, the night before the EXAM... I appreciate videos likes these.

@karinj5677 5 лет назад

hope ur exam went well :)

@TheOrganicChemistryTutor 5 лет назад

at 5:38 - a simplified version of the n+1 rule was applied to get a quintet (5) for signal B. Even though most spectrums will show a signal that appears to be a quintet for this type of situation - it does not give the most accurate description of what is happening. The quintet signal is really an overlap of other signals. Proton A (3H) splits proton B into a quartet and Proton C splits proton B into a doublet giving us either a doublet of quartets (2 x 4) or a quartet of doublets (4 x 2) which gives us a total of 8 signals. Some spectrums won't show 8 signals but may show 5 due to an overlap of signals. Nevertheless, the simplified N+1 rule can still be used to help you get the right answer in some situations but it does not reflect what is truly happening in the molecule. A similar situation applies when protons B and D split the signal corresponding to protons C.

@The-Khatalyst 2 года назад

5 years after this video and you're still saving lives. My professor explained the doublet, triplet, etc as, "You look like like your neighbor on NMR. So does a Russian and an Italian look the same? No. But when they are neighbors on the NMR they look like each other." No idea what the hell he was talking about. Thank you for the simple explanation.

@Schoolerino-pj8pu 6 месяцев назад

that's kinda racist ngl

@davidkempjr.7045 8 лет назад

Bro, I was following you and understanding your lecture. Thank you.

@noahploof7967 Год назад

As an O chem tutor there is nothing nicer than your videos to refresh my memory on the material I purposely forgot.

@arturobarchiesivitali397 5 лет назад

What I love from u is that, despite oof how much I dont like this topic, you make me enjoy it. Thanks man!

@DeniseP 3 года назад

You really are the chemistry god LOL. Thank you so much for creating these videos. I've been watching them since Gen chm I and now im in Orgo II. Sooooo helpful.

@nicolemcclurekurlbaum1462 7 лет назад

Just wanted to say thank you for posting such great videos. Because of your reviews (and some work on this end internalizing your lessons), I did really well on the ochem portion of the DAT. And, now that I have to take ochem II, this video is about to save me the embarrassment of having forgotten literally everything I knew about NMR. Ha! So, yeah, thank you for taking the time to do such a great job. It's having a real, measurable impact on my life.

@TheOrganicChemistryTutor 7 лет назад

Hi Nicole, I'm glad those videos prove very helpful to you. Thanks for posting this comment. I really appreciate it.

@mukundaneanthony1036 2 года назад

Hi Nicole

@calebriggins5628 4 года назад

Our teacher is literally giving us nmr (proton and carbon), mass spec, and ir and telling us to come up with a structure

@allieb3477 4 года назад

Same here. I´m afraid lol

@rishisolanki783 3 года назад

It's fun trust me😂

@Hehexddddd 3 года назад

Just google the molecular formula and add the functional group u obtained from ur ir then google should be smart enough to do ur work for u

@amacgregor92 3 года назад

@@Hehexddddd This won't help on the ACS

@ishaankulkarni849 3 года назад

Same here mate...just that the mass spec is missing..we have the molecular formula instead..

@cm-pd2hx 6 лет назад

"spin spin splittin" love how you say that, haha thanks for your help.. This channel gets me through life

@Annie-it1cw 4 года назад

The fact that your voice is also so soothing makes this 10x better. Thank you.

@Dm-hz9mm 5 лет назад

Who else is feeling 100x better?

@razabazal4669 4 года назад

aced my spec test could not have done it without your help thanks so much again and again and again!!!!!!

@92jwiener 5 лет назад

This helped me understand spin splitting way more than my class did. Thank you

@homegirl934 2 года назад

Your lectures are always useful... thanks for being such a wonderful source of knowledge

@GreasyRhysi 4 года назад

OChem midterm in 5min and what do I watch? Thank god for this guy.

@MuhammadTariq-qn2wl 5 лет назад

Great method of teaching.a river of knowlege about chemistry.

@SM-gc2tx 7 месяцев назад

you are a lifesaver. I go to lecture and it is all just a blur by the time I walk out & reread my notes. the text is useless. we have guided prctice on campus but we dont get through much in each session. in other words, I don't know what I would do without you!!

@thaliahoyos6773 4 года назад

I can google whatever i need and one of your videos will always pop up... THANK YOU!

@amitsoni-rn9tq 2 года назад

Splitting patterns which you explained was really good;understood the exact concept and also after solving some problems..

@joseliinbabee 4 года назад

i had been learning this for weeks and didn't understand it until right before my spec exam, only missed 1! thank you !!!

@joaovaldez9190 6 лет назад

please make more videos on finding structure by looking at an H NMR spectrum with signals

@deborahessilfie8064 3 года назад

Woooow 👏👏👏 you make it easier to understand organic chemistry. Thank you very much 😊

@michellla93 3 года назад

Love you Organic Chemistry Tutor!

@I_dont_even_work_out 2 года назад

This man knows everything

@mathieux2101 3 года назад

How is E 15:04 different than the Ds. The hydtogens are both attached to a carbon whose adjacent carbons are both secondary.

@emeka3033 3 года назад

Yes, I need clarification with this question as well

@theadvancetradingacademy1033 2 года назад

I'm seeing this video after 5years of release... Thanks cause its very helpful

@jeallybeanjohns2958 2 года назад

You save my life. Thank you very much ❤

@fereshtehfarahani9709 3 года назад

Thanks for your teaching ❤️ i use your episode lots of the time and I solve my problems several times 🌹🌹🌹

@MuhammadQasim-fu4hb 2 года назад

You are extremely proficient at explaining concepts !

@mohamedazizjaziri2444 3 года назад

All respects dude , thanks alot for your help U are really making it easy to understand not like my teacher in class 🙄😑

@mukundaneanthony1036 2 года назад

Thanks Mr, you people your really helping us a lot, like i can learn things even when iam still in the holiday

@heatherbegley8473 7 лет назад

Wouldn't the Hydrogens on the CH2 next to the chiral carbon in the first example produce two different signals? Or am I mistaken? That was a chiral carbon bonded to the bromine, correct?

@austintuttle5723 6 лет назад

Heather Begley ... Yep. Those hydrogen's are diastereotopic. He made a mistake

@drgrunental3865 6 лет назад

Why is that?

@ladyinred396 5 лет назад

You are right

@LadyShaydex 5 лет назад

Why would the two hydrogens on the CH2 produce 2 different signals? They're in the exact same spot with the exact same effect. They are both 2 carbons away from bromine. So they should produce 1 signal

@raanoooshh9296 4 года назад

They're in the same chemical environment. They are attached to the same carbon atom so they would only show as one signal.

@yikes9921 2 года назад

I would really love to meet you some day. Thank you so much!!

@exaverymwasomola3615 7 лет назад

be blessed Mr i was following you are lesson actually i got new concept

@davidodubona1876 3 года назад

Thank you for this, you have saved my ass multiple times I have a question about the second multiple choice practice problem. I believe option "D" should have just 4 signals and not 5. 20:00, B and C should appear simultaneously. As soon as you can get back. Thank you!

@mariamiqbal6304 2 года назад

thnx a lot sir ..it help me a lot in Mphil

@michelleneman6883 8 лет назад

So helpful thank you!!!

@_dilaraesenn 2 года назад

best video for this point so thank you💘

@natty573 3 года назад

Saved my life❤️

@nasserBack 6 лет назад

Please make videos for C-NMR and Mass spectrometry. I am welling to pay for both videos. All I care about is to pass these two complicated topics

@syedwaseemulla95 2 года назад

My Great teacher...

@frankieaceves2279 5 лет назад

You should make one on Carbon nmr

@rithvikganti6252 3 года назад

this was excellent, thank you so much

@Carolchew96 6 лет назад

Your video helped me a lot, thank you!

@emanalkhateeb5870 3 года назад

Much more love, much more respect bro.

@hej-ky4qk 2 месяца назад

thank you sair my posay gonna pass O chem

@shinygm715 6 лет назад

Better Understanding👌

@demiladecatherine5603 Год назад

Thank you so much for this

@t.i628 6 лет назад

Thanks so Much for the clarity. please make more videos. Grade saver!!!

@jadmelhem3827 4 года назад

Bro you saved my life

@ramayabowen294 4 года назад

I understood more in a 30 min video than i did in a whole month of class

@abhipshitkalita9783 2 года назад

Thanks a lot sir. You are great

@cdelcarmen90 6 лет назад

awesome video, just wondering... 5:30 because the a and c protons are not equivalent shouldn't the N+1 rule be applied individually to each proton to find the signals for b? that would give a doublet of a quartet right?

@kingkaigus3222 6 лет назад

Carlos Del Carmen thats what i thought. I thought the rule was if a hydrogen has two adjecent atoms with hydrogens of different signals. Then the rule is (n+1)(m+1)

@drgrunental3865 6 лет назад

@@kingkaigus3222 what's m?

@nessyandtot 5 лет назад

no, they are too far apart. They have to be within 3 bonds of each other to split...within 4 bonds if there is a double or triple as one of the bonds

@wittyusername9544 2 года назад

Please can you make a video on heterotopic, enantiotopic, diastereotopic, and homotopic hydrogens? It’s in the curriculum now.

@ertanissever7047 3 года назад

In the first example (4.25), A and D carbons are primer. Why one of them is 0.9 other one is 1.0??? Thank you for your videos.

@EEBADITYAPANDEY 3 года назад

the one which has 1.0 is more nearer to the electronegative atom so more deshielding (for 1.0 one) and so more magnetic field(or resonant frequency) is required.I hope that solves your doubt.

@srirenuga1678 2 года назад

Kindly, Turn on the Captions so that some people like me need not to run again the video to get your words ....

@haddadmj96 7 лет назад

Very useful video, thank you so much!

@jackiepaper426 6 лет назад

What if you don't know the chemical formula? What if all you have is the molar mass, IR and C and H NMR data?

@johnathancerda8976 4 года назад

Rule of 13

@lavina3535 4 года назад

You are an angel, a lifesaver!!

@AhmadNavidHazara 4 года назад

you saved my degree!

@SpesMagisteriiGradus 7 месяцев назад

thank you!

@Antheaojadi 7 лет назад

at 13:48 why would it only be 2 signals and not 3? if you draw the line of symmetry aren't there 2 more groups unaccounted for?

@ChrisBranleh 7 лет назад

You da REAL MVP

@iivia 2 месяца назад

Thank you sm❤

@AllDayErrDay. 4 месяца назад

Shouldn't the protons on the B Carbon at 4:05 be a tad bit further downfield (say 1.2-1.3) due to being closer to a partially positive CH? Just like the CH3 is on the D Carbon.

@ladyinred396 5 лет назад

Why 5:32 hydrogens B are not doubled of quartet ?

@amadiebuka8006 6 лет назад

uR #Work is qreat

@amadiebuka8006 6 лет назад

are we allowed to post videos too???

@wa3452 3 года назад

thanks, you are the best

@paigecampbell9094 5 лет назад

Why doesn't the carbonyl carbon get a signal at 9:00?

@ernestogonzalez428 5 лет назад

Paige Campbell Only carbons that have hydrogens directly bonded to them will get signals

@stephaniepainchault2815 5 лет назад

Why @ 15:00 is E it’s own signal? Does it not have an identical chemical environmental to D with two adjacent H’s?

@raanoooshh9296 5 лет назад

I did not understand that one either. It's adjacent to secondary carbons as well ...

@raanoooshh9296 5 лет назад

I think I just figured that one out lol. It's more distant from the oxygen, you could compare it to the example before and see why that one had carbons with the same environment.

@LadyShaydex 5 лет назад

Yes but it's a carbon further away from oxygen than D. You can't just look at the close neighboring atoms, you have to look at the whole molecule.

@123anmerocks 5 лет назад

do you a review video on NMR in HD?

@akashsunil7464 Год назад

In the first question the ch2 has non equivalent hydrogen atoms next to it attached to ch3 and ch in different chemical environments so wouldn't complex spin spin coupling or signal splitting pattern occur so would the n+1 rule hold or can we just ignore it

@matymh944 5 лет назад

Thank you so much 🌸🌸

@krish_krish354 6 лет назад

Nice bro . keep it up

@tesfayeayisa1253 2 года назад

thanks its a great v

@alisharo58 4 года назад

Also, at about 5:45, why are you not complex splitting the B and C hydrogens? You're doing the n+1 rule, even though the environments (the adjacent beta-hydrogens on each side of them) aren't equivalent? Why??

@begumozkardes6901 6 лет назад

Thank you !!

@LukasHanc 4 года назад

you are a god amongst men

@xiR3BORNix 5 лет назад

Thank u mark wahlberg

@MR-lt3jj 4 года назад

@17:36 why isn't the C=O a signal? Wouldn't that make the compound have 4 signals? (You only marked 3)

@dorothyotogbolu6485 6 лет назад

pls make more videos o n this topic

@karthikdk309 3 года назад

What about OH and NH🤔🤔

@amiraelbhery8120 7 лет назад

it was very helpful for me thanks a lot

@eniamrahc73 6 лет назад

God bless you

@lucassantos-sd9vm 5 лет назад

That was the video that saved my ass

@GalaxyDude96 2 года назад

@5:17 Aren't the two protons on the CH2 different since they are diastereotopic?

@emansalem5288 7 лет назад

Your amazing more video please ☺️

@shimaali1042 2 года назад

why translation is not found in this video

@benazira2443 2 года назад

You have a nice voice …

@mzfq5207 3 года назад

i need subtittles please 😊

@yippee507 3 года назад

u saved me

@samrajabeen5089 6 лет назад

Sir,you did'nt tell about chiral centre...there should be 5 signals in 1st example. is'nt .?

@BrunaLobo 5 лет назад

Thank you 🙏🇧🇷

@marisacasciola7287 5 лет назад

I don't understand how the example at 15:00 has symmetry at where he put a dotted line. Can anyone help me out? I think he place a D and the E in the wrong place.

@alejandropinedarojas48 5 лет назад

The pi electrons of the aromatic ring aren't localized as he draws it.

@HipHopFan1654 7 лет назад

Love your videos! Quick question, my prof specifically said never to add neighboring hydrogens (for e.g. In the first problem when you added 1H + 3H for a CH2 carbon), and that it wouldn't turn into a quintet but into a doublet of quartets, so where you just simplifying the problem for this video purposes? Does that still stand for the same thing? And is it wrong?