In the acetate ion, CH3COO−, the carbon atom of the methyl group is designated C-1 and the carbon atom of the carboxylate group is designated C-2. Which pair correctly describes the molecular geometries around C-1 and C-2, respectively?
a) Trigonal planar; tetrahedral
b) Tetrahedral; trigonal planar
c) Trigonal pyramidal; trigonal planar
d) Tetrahedral; tetrahedral