Question

How will you distinguish para hydroxy benzaldehyde and salicylaldehyde through ir spectra?

Answer 1

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Answer 2

We can distinguish para hydroxy benzaldehyde and salicylaldehyde through IR spectra on the basis of hydrogen bonding.

Explanation:

• In salicylaldehyde, due to the presence of intramolecular hydrogen bonding, the bands on O-H and C-O bands are shifted to a lower wavelength
• Due to intramolecular hydrogen bonding change in concentration at different positions takes place.
• In the case of para hydroxy benzaldehyde, the bands of O-H and C-O take place at lower wavelengths.
• It is due to the inter molecular hydrogen bonding.