when the stretching frequency of a carbon-carbon double bond is 1650 ?????????1 the stretching frequency of a carbon-carbon triple bond is
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Halogens
Halogenated organics do not give good group frequencies. Bands from carbon–halogen stretching are spread across quite wide ranges; ν(C–F) is anywhere from 1350 to 1000 cm−1, while for C–Cl, C–Br and C–I stretching bands are 1100–500 cm−1. Where carbon is aromatic, the frequencies tend to be higher than for aliphatic in each case. With the exception of fluorine (in the IR), the bands are of medium intensity so that it is difficult to differentiate them from the multitude of others in these regions.
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Halogenated organics do not give good group frequencies. Bands from carbon–halogen stretching are spread across quite wide ranges; ν(C–F) is anywhere from 1350 to 1000 cm−1, while for C–Cl, C–Br and C–I stretching bands are 1100–500 cm−1. Where carbon is aromatic, the frequencies tend to be higher than for aliphatic in each case. With the exception of fluorine (in the IR), the bands are of medium intensity so that it is difficult to differentiate them from the multitude of others in these regions.
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