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1) In H NMR spectroscopy, why is the peak for a vinyl proton, C=C-H, shifted downfield...

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Chemistry

1) In H NMR spectroscopy, why is the peak for a vinyl proton,C=C-H, shifted downfield relative to that of an alkane proton,C(sp3)-H? Be sure to use the following terms in youranswer: pi-electrons, induced magnetic field, and resonance.

2)  In H NMR spectroscopy, why is the peak for a-CH2F group shifted downfield relative to that for a-CH2Br group? Be sure to use the following terms in youranswer: electronegative, deshielded, magnetic field, andfrequency.

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