Carbonyl carbon in acetone is $sp^2$ hybridized. The C-O-C bond angle and the geometry of acetone is........

120°; trigonal coplanar

The correct answer is Option (1) → 120°; trigonal coplanar

In acetone (CH₃–CO–CH₃):

• The carbonyl carbon is sp² hybridized → three regions of electron density
• Geometry around carbonyl carbon → trigonal planar
• C–C=O bond angle ≈ 120°