This question is about infrared spectroscopy.
State the four different modes of vibration in molecules that have characteristic frequencies of vibration.
State why molecules of oxygen, chlorine and hydrogen are each inactive in infrared spectroscopy.
Complete the table by adding the expected wavenumber range for the given bonds.
Bond | Wavenumber / cm-1 |
C–O in a carboxylic acid | |
O–H in an alcohol | |
CN in a nitrile |
2-methylpropanal has the structural formula (CH3)2CHCHO.
Identify a peak that suggest that this infrared spectrum belongs to 2-methylpropanal.
2-methylpropanal has different C–H peaks in its infrared spectrum due to the complex interactions between vibrating and bending bonds.
The peak at around 1400 cm-1 is an absorption due to the C–H bond in the aldehyde group.
State the name given to the region, on the infrared spectrum, that this peak is found in.
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