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Cis1,2 dichloroethayl is IR active with respect to carbon double bond carbon?
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Cis1,2 dichloroethayl is IR active with respect to carbon double bond ...
Understanding IR Activity of Cis-1,2-Dichloroethylene
Cis-1,2-dichloroethylene (C2H2Cl2) exhibits interesting properties, particularly regarding its infrared (IR) activity related to the carbon-carbon (C=C) double bond.
1. Molecular Structure
- Cis Configuration: The molecule has a cis configuration, meaning that the two chlorine atoms are on the same side of the double bond.
- Polarity: This arrangement results in a polar molecule due to the electronegativity difference between chlorine and carbon.
2. IR Active Vibrations
- C=C Stretching Vibration: The C=C double bond can undergo stretching vibrations, which involve changes in the distance between the two carbon atoms.
- Dipole Moment Change: For a molecule to be IR active, there must be a change in dipole moment during the vibration. The cis configuration of 1,2-dichloroethylene allows for such a change as the polar C-Cl bonds influence the overall dipole moment during C=C stretching.
3. Symmetry Considerations
- Symmetry: The molecule's symmetry plays a crucial role in determining IR activity. The cis isomer is less symmetrical than its trans counterpart, leading to a greater likelihood of IR activity.
- Selection Rules: According to the selection rules for IR spectroscopy, the presence of a dipole moment change during molecular vibrations is essential for IR activity.
4. Conclusion
In summary, cis-1,2-dichloroethylene is IR active concerning the C=C bond due to its molecular structure, the nature of its vibrations, and the resulting changes in dipole moment, making it detectable in IR spectroscopy.
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Cis1,2 dichloroethayl is IR active with respect to carbon double bond carbon?
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