Why is the bond angle in alcohols slightly less than the tetrahedral angle, whereas the bond angle in ether is slightly greater?
Bond angle of being slightly less in alcohol compared to the tetrahedral bond angle. This phenomenon occurs because-
The C-O-H bond angle in alcohols is slightly less than the tetrahedral angle because of the repulsion between the two lone pairs of electrons on oxygen atoms as these pairs pushes the C-O bonds closer to each other.
In case of ethers, the oxygen atom is attached to bulky alkyl groups, hence repulsion between these R groups pushes the two C-O bonds away from each other and hence the bond angle is slightly greater than the tetrahedral angle.