Final answer:
The molecule with the highest bond angle is BF₂ (option a). BF₂ is a linear molecule with a bond angle of 180°.
Step-by-step explanation:
The molecule with the highest bond angle is BF₂ (option a).
BF₂ is a linear molecule with a bond angle of 180°.
In comparison, NH₃ (option b) is a trigonal pyramidal molecule with a bond angle of around 107°, CO₂ (option c) is a linear molecule with a bond angle of 180°, and SF₆ (option d) is an octahedral molecule with bond angles of 90° and 180°. Therefore, BF₂ has the highest bond angle among the given options.