Which of the following compounds would exhibit highest dipole moment?
A) Ethers
B) Alcohols
C) Carbonyl compounds
D) Carboxylic acids
Correct Answer:
C
Solution :
The order of dipole moments Methanol has higher dipole moment than dimethyl ether because oxygen of \[O-H\] bond can withdraw electrons from H atom more easily as compare to oxygen of \[O-C\] bond, thus becomes more polar. Acetic acid and acetone has higher dipole moment than methanol, because both has a \[s{{p}^{2}}-\]hybridized oxygen atom which is more electronegative and electron withdrawing as electronegative and electron withdrawing as compare to \[s{{p}^{3}}-\]hybridized oxygen atom\[(C-O)\]. Whereas the small dipole moment of acetic acid as compare to acetone is due to the dispersion of negative charge between two oxygen atoms.