Textbook problem 2.45

[isaiah_granados_2l]

Hi everyone,

This question asks us to identify the composition of bonds and hybridization of each lone pair for the molecule H2C=CHCHO. My confusion is regarding the two lone pairs on oxygen. The answer key says they will have Osp2 hybridization. But I am confused because I thought since they're lone pairs they wouldn't undergo hybridization. Why wouldn't the orbital just be s?

[Deven Patel]

Lone pairs do count for hybridization as they are sources of electron density. For example, H2O has a hybridization of sp3 as Oxygen is bonded to 2 H atoms and has 2 lone pairs.