Answer
See the answer below.
Work Step by Step
a) Angles 1 and 3: 120°, the geometry around the central carbon is trigonal planar (3 ligands, no lone pair).
Angle 2: 109°, the geometry around the oxygen is a bent one, from the tetrahedral archetype (2 ligands, 2 lone pairs).
b) The double one, bond length decreases with bond order.
c) The O-H bond, because it has the biggest difference in electronegativity between the ligands.
