Chemistry and Chemical Reactivity (9th Edition)

a) Sulfur is bonded to two atoms and has one lone pair, it's in a bent geometry from the trigonal planar archetype, so this bond angle is approximately 120$^{\circ}$. b) Boron is in a trigonal planar geometry, this bond angle is approximately 120$^{\circ}$. c) Carbon is in a trigonal planar geometry, this bond angle is approximately 120$^{\circ}$. d) The central carbon in angle 1 is in tetrahedral geometry so this bond angle is approximately 109$^{\circ}$. The central carbon in angle 2 is in linear geometry this bond angle is approximately 180$^{\circ}$.