Nmr

[pesanserinus]

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hi guys

Ive been having difficulty with this spectrum interpretation problem

http://www.wfu.edu/~ylwong/chem/nmr/h1/ex2/paBrpentane.html

can someone explain the splitting of C3 to me?

Thanks!😀

 

[Majik]

There should be 5 signals, not 4 since there are 5 different Hydrogen environments. The third carbon has 4 neighboring hydrogens. Therefore, it should split into 5 peaks (n+1 rule). This is a similar splitting pattern to the hydrogens on carbon 2, however, the hydrogens on carbon 2 should appear more downfield because they are closer to the electronegative atom, Bromine. The correct answer they said is B, but I believe that's a mistake they've made. Just my two cents. Hope this helps.