At 200MHz when the 1H NMR spectrum of acetone, CH3COCH3, is recorded on an instrument operating, a single sharp resonance at 2.1δ is seen.
1. Determine the numbers of hertz downfield from the TMS does the acetone resonance correspond to?
2. Explain what would be the position of the absorption in δ units if the 1H NMR spectrum of acetone were recorded at500MHz?
3. Determine the numbers of hertz downfield from the TMS does this 500 MHz resonance corresponds to?