Chemistry 360 - Athabasca University

CHEM360 Report Book 2012-14Exp.147. A very common splitting pattern seen in a 1 H-NMR spectrum (see Unknown X spectrum below) is the‘2H quartet coupled to a 3H triplet’. Which of the following molecular fragments does this represent?a. a methyl groupb. an ethyl groupc. an isopropyl groupd. a tert-butyl group1 H-NMR spectrum for Unknown X showing a ‘2H quartet coupled to a 3H triplet’8. Another very common splitting pattern seen in a 1 H-NMR spectrum (see Unknown Y spectrumbelow) is a ‘1H septet coupled to a 6H doublet’. Which of the following molecular fragments doesthis usually represent?a) a methyl groupb) an ethyl groupc) an isopropyl groupd) a tert-butyl group1 H-NMR spectrum for Unknown Y showing a ‘1H septet coupled to a 6H doublet’ (ignore the singletalso shown in this example)48