Answer
See the answer below.
Work Step by Step
a) Angles 1, 3, 5: 109°, the geometry around the central atom is tetrahedral (4 ligands, no lone pair).
Angle 2: 120°, the geometry around the central carbon is trigonal planar (3 ligands, no lone pair).
Angle 4: 109°, the geometry around the central atom is bent from the tetrahedral archetype (2 ligands, 2 lone pairs).
b) The O-H bond, because it has the biggest difference in electroneutrality between the ligands.
