Multiplicity: n + 1 rule | Spectroscopy | Organic chemistry

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Multiplicity: n + 1 rule | Spectroscopy | Organic chemistry | Khan Academy

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Using the n+1 rule to predict how many peaks to expect from spin-spin coupling. Created by Jay.
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Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions chemists use to synthesize crazy carbon based structures, as well as the analytical methods to characterize them. We will also think about how those reactions are occurring on a molecular level with reaction mechanisms. Simply put, organic chemistry is like building with molecular Legos. Let's make some beautiful organic molecules!
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Пікірлер: 21

@afrahkhizer7062 8 жыл бұрын

Thanks for this series of video. It was really helpful. Khan academy rocks!!!

@dq9021 6 жыл бұрын

I always hear that someone say something rocks. What does this rocks mean?

@TrueCourse 8 жыл бұрын

Question.... at 8:30, you mentioned that the protons in 1,2-dichloroethane are chemically equivalent - therefore, the neighboring protons do not result in spin-spin splitting (1 signal). You also mentioned that the neighboring protons in 2,3-dimethylbutane result in splitting, which I understand that each proton in this compound experience induced magnetic fields from each other, causing the signal split. Why can't this be the same case for the protons in the earlier compound? Did I miss something here? Please explain. Again, thanks so much for your wonderful and clear presentations! :)

@emoemo6960 6 жыл бұрын

TrueCourse chemically equivalent protons experience the same applied magnetic field and absorb the same frequency and that is why they should appear as same signal. In dichloroethane, all 4 protons are chemically equivalent or identical and so all absorb at the same frequency.

@manishsuryapalam364 5 жыл бұрын

Did you ever end up figuring this out?

@tareqahmed9190 2 жыл бұрын

Series of Videos helped me a lot. Also the presentation is really good to understand.

@Wessam12345678910 7 жыл бұрын

Thank you for these videos, they helped out alot. One question: why do we only look at the neighboring protons? for example couldnt one of the red protons in the 2nd example add or subtract from the effective magnetic field felt by the other? Thanks in advance.

@shrimpboyho 8 жыл бұрын

Thanks for this video. It really helped.

@samman9478 2 жыл бұрын

Great vid as always but I have one question: In 0:20 it’s been said that the n+1 rule applies only in equivalent proton but in 8:30 it’s been mentioned that equivalent ones do not show splitting. Can anyone please explain that part because it’s really confusing

@Beanzybeez 7 жыл бұрын

Thank you! you just saved my life!

@zainabahmad9445 6 жыл бұрын

nice...!!

@samuraixyz22 8 жыл бұрын

Good one...thanks

@imanhamdullah6059 3 жыл бұрын

Brilliant

@moodleblitz 4 жыл бұрын

What do you mean by "a different environment"?

@waleedalarmanazi159 3 жыл бұрын

The surrounding atoms are different, like for example; CH3 has three protons attached to the carbon, they are called "equivalent protons" as they share the same environment duo to attachment to the same carbon and thus same sequence of attached atoms after the carbon

@polloshermanos5443 5 жыл бұрын

The protons on the ring aren't equivalent.

@ruioliveira2160 5 жыл бұрын

Yeah, that sentence from 0:00 to 2:40 sensitively in the right top corner, the (equivalent) between parentheses is misleading/confusing me cause it's like it's restricting the n + 1 rule to be applied only with neighbouring protons that are equivalent, which isn't the case in the ring protons since they're experiencing different environments, which caused them to be splitted. Therefore, they aren't equivalent neighbours to each other! Did the author of the video forgot to include the n + 1 rule also with non equivalent neighbour protons or what? If so, then some of the exercises shown here including with the protons in the ring were wrongly shown! Am i the only one who's catching this up besides with Jonathan Benitez and the two persons who like his comment assuming they know what's going on?..