Two different values, less than 180°, are observed for the bond angles in which of the following basic structures for molecules and ions?

A) tetrahedral

B) octahedral

C) linear

D) trigonal bipyramidal

E) planar triangular

Solution: Tetrahedral shape has a 109.5° angle. Linear has a 180° angle. Trigonal bipyramidal has two different angles, 120° and 90°. Octahedral has a 90 ° angle. Planar triangular has a 120° angle.