Final answer:
The IR spectrum for CH bonds in molecules with sp2 double bonds typically shows weak absorption peaks in the 2800-3100 cm-1 range due to stretching vibrations. The position and intensity of these peaks can vary depending on the compound.
Step-by-step explanation:
The IR spectrum for CH bonds in molecules with sp2 (double) bonds can vary depending on the specific compound. However, in general, the stretching vibrations of the CH bonds in sp2 hybridized carbons can be observed in the range of 2800-3100 cm-1 in the infrared spectrum. These stretching vibrations are typically weaker and less intense compared to CH bonds in sp3 hybridized carbons.
For example, in alkenes, which have a C=C double bond, the IR spectrum may show a weak absorption peak in the 2800-3100 cm-1 range due to the stretching of the CH bonds adjacent to the double bond.
It's important to note that the IR spectrum is specific to each compound, so the exact position and intensity of the CH bond peaks can vary.