So I understand the theory behind proton NMR, singlet, doublet etc... D shows no peaks, and so on.
I just don't know how to apply the knowledge to exam questions, it's losing me at least 8 marks most occasions.
For instance, when looking at the data sheet
http://www.ocr.org.uk/Images/74947-datasheet.pdf and go to 2.5ppm, I don't know what to pick out of the 4 possible structures! How do I go about learning how to differentiate between them?