م A 'H NMR signal is observed at 175.0 Hz (downfield of TMS) on a 115-MHz instrument. a) What is the observed chemical shift in parts per million (ppm)? b) What is the chemical shift, in parts per million (ppm), if the sample is analyzed with a 500.0-MHz instrument? 1521.7 Chemical shift is ppm Incorrect 350 Chemical shift is ppm Incorrect c) Where will the proton signal appear, in hertz, if the sample is analyzed with a 500.0-MHz instrument? 175 The downfield signal is Hz HI

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