How To Determine The Number of Signals In a H NMR Spectrum

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[@adnan8837]

12:43 I'm pretty sure there should be two lines of symmetry (one vertical, one horizontal) so H-NMR should have 1 signal

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Thank you so much for making NMR so clear to me

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[@zaminahmed297]

Hey for the HNMR to CNMR can I assume that the CNMR number will be 1 number higher than my HNMR number

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[@ali_SM444]

Could you have significantly more C environments then H? Like 5 H, and 9 C?

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[@BossManWebbMerica]

at 4:20, would signal A not be 2 separate signals since the 2 methyl groups on carbon 2 neighbor carbons 1 and 3, while carbon 1 neighbors carbon 2 and its 2 methyl substituents? c-c rotation doesn't seem to rationalize your explanation.

[@Robin-bm4sp]

No, having a building set for this would help you. But you can look up any “tert-butyl” substituted molecule it’s 3D structure (tetrahedral). You’ll see that they are fully equivalent easily from its 3D structure. They all 3 are equally far from the 4th R-group.

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[@natcarde7385]

minute 14:22, shouldn't we have a total of 6 H-NMR signals with the H attached to the Ethyl group? where the "f" carbon is?

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No because carbon has 4 bonds to it. There is a double bond.

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Sooo carbon 13 signals are signals that have 4 bonds attached to other carbons as opposed to tertiary carbons with h’s hanging off?

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Do we always have to make the line of symmetry and if not then when we have to?

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[@MuhammadIsmail-vv3do]

In my NMR graph (700mhz) in getting protons signals as δ = 1.08 - 1.57 (m, 1.92H).. Im getting protons in decimals. How do u solve that?

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[@Jojo-qx1zq]

One question remains: Why can you just apply a line of symmetry for the benzine ring of ethylbenzine? I thought that every H-Atom of the molecule has a different signal because there is no symmetry. For example, you say that the H-Atoms at position C2 and C6 are equivalent, as they are equally distanced from the ethyl group. But is the terminal CH3 group of ethyl not closer to the H-Atom at C6 than to that at C2? Wouldn't there be a chemical effect?

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[@juliettechollet6044]

I think he made a mistake in the example around 7:30. There are only 3 bonds shown for the carbons that make forks, meaning that another H is attached. Doesn't that emit a 4th signal? That would be consistent with what he shows at 5:59. If someone could confirm or explain why this isn't so that would be great.

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Yeah, I am confused maybe he just forgot

[@HimanshuSharma-xn6uc]

No he is correct there will be 3 signal only

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Sir, still I couldn't understand aromatic hydrogens can you make a separate video for that alone, so that I would be grateful to you.

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Hello,pls how do I know where to place my line of symmetry when having substitute on a benzene ring

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do double bonds not matter when determining symmetry?

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[@princessogwu2939]

But how many atoms, though?? Can someone explain how to count the unique number of 13C or 1H atoms in the molecule? Do you just count them like in the molecular formulas of the compound?

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