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1.Are the effects on chemical shifts of attached electronegative atoms additive? Explain. 2.What is the purpose...

1.Are the effects on chemical shifts of attached electronegative atoms additive? Explain.

2.What is the purpose of TMS?

3.Which is more energetic: 235 nm or 325 nm light? Explain.

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Answer #1

1. The effect of electronegative atoms on their neighbours is called an inductive effect because electronegative elements draw attached carbons downfield.

2. Tetramethylsilane (TMS) is the organosilicon compound having formula Si(CH3)4. TMS is the accepted as the internal standard for calibrating chemical shift for 1H, 13C and 29Si NMR spectroscopy in organic solvents.

3. The energy of light is given

thus we see that E is inversely related to wavelength.

therefore lesser wavelength light has more energy, 235nm has more energy

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