Aromatics • Due to the delocalization of electrons in the ring, where the bond order between carbons is 1 %, the stretching frequency for these bonds is slightly lower in energy than normal C=C • These bonds show up as a pair of sharp bands, 1500 (s) & 1600 cm-1 (m), where the lower frequency band is stronger • •C-H bonds off the ring show up similar.to vinyl C-H at 3000- 3100 cm-1 (m)

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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explain me the concept

Aromatics
• Due to the delocalization of
electrons in the ring, where the
bond order between carbons is 1
½, the stretching frequency for
these bonds is slightly lower in
energy than normal C=C
• These bonds show up as a
pair of sharp bands, 1500 (s) &
1600 cm-1 (m), where the lower
frequency band is stronger
• • C-H bonds off the ring show
up similar to vinyl C-H at 3000-
3100 cm-1 (m)
CS Scanned with CamScanner
Transcribed Image Text:Aromatics • Due to the delocalization of electrons in the ring, where the bond order between carbons is 1 ½, the stretching frequency for these bonds is slightly lower in energy than normal C=C • These bonds show up as a pair of sharp bands, 1500 (s) & 1600 cm-1 (m), where the lower frequency band is stronger • • C-H bonds off the ring show up similar to vinyl C-H at 3000- 3100 cm-1 (m) CS Scanned with CamScanner
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