Chapter 9 Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals - Study Questions - Page 369d: 49

See the answer below.

a, b) Since all carbons make 4 single bonds, they are all $sp^3$ hybridized and thus the COH angle is approximately 109°. c) The molecule is polar because it has asymmetrical polar bonds (OH and CO). d) It is nonplanar because all carbons involved display tetrahedral geometry; therefore they can't be all in the same place.