Explain how mass effects act to lower the carbonyl frequency, as well as how inductive and hyperconjugation effects act to raise the carbonyl frequency of aldehydes relative to ketones.© BrainMass Inc. brainmass.com October 10, 2019, 1:09 am ad1c9bdddf
Fundamental frequency equation in IR spectroscopy is v2=1/4π2(K2/µ2) Since the mass factor comes in the denominator increase in mass decrease the frequency of absorption. Due to less electron donating capacity of Hydrogen (in aldehydes) the mass of carbon does not change, in case of ketones due to the electron donating nature of alkyl groups electron density around carbon ...
The expert explains how mass effects act to lower the carbonyl frequency. inductive and hyperconjugation effects are examined for aldehyde relative to ketones.