Help with NMR

[rcwha]

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Hi guys,

I was wondering if somebody could help me with the nmr problems that are usually on the DATs. Problems that ask number of peaks or how many singlets and triplets etc.

For example, can somebody walk me through this problem:

The h'nmr of m-xylene will show:

The answer is 4 peaks with 2 singlets and 1 doublet and 1 triplet....

Also, does a singlet have one or two adjacent hydrogens?


Thanks

 

[AndyK]

Lol, that PDF was pretty neat dude, I mean with all those colors and step by step solution. I liked it!

Yeah it's what happens when you combine boredom, a tablet PC and SDN.

 

[Maygyver]

I agree with maygayver, but I think for 'a', there should be one singlet, as the Hydrogens on both methyl groups are equivalent.
also there should be one doublet only, again because the hydrogens on C4 and C6 are equivalent.

Uh...the 2x is representing the relative height of the peak. Two equiv hydrogens would make a peak roughly double the height of 1 equiv hydrogen.

Multiple singlets wouldnt be a singlet would they? lol

 

[harrygt]

Uh...the 2x is representing the relative height of the peak. Two equiv hydrogens would make a peak roughly double the height of 1 equiv hydrogen.

Multiple singlets wouldnt be a singlet would they? lol

Oh ok, then I get what you meant by x2. By the way, the height of two equivalent H would still be the same as one. The integral would be double.
Agree?

 

[Maygyver]

Oh ok, then I get what you meant by x2. By the way, the height of two equivalent H would still be the same as one. The integral would be double.
Agree?

The height wouldn't be the same but yes the integral would be double. That's why I said roughly.