Can't tell u in general if a or b, depends on what AB2 is, e.g. CO2 is linear, H2O is tent shaped (corner at midst atom: 105o) but not trigonal as you'd call it.
Anyhow c, d, E are unusual for tri-atomic.
H2O is not in the form AB2. When in the form AB2 the ideal bond angle is 180 degrees or linear.
See the link below.
The molecular geometry of a nitrogen molecule is linear.
The molecular geometry of the CF3H molecule, based on its Lewis structure, is trigonal pyramidal.
The molecular shape of a magnesium hydride molecule is linear. Magnesium has a +2 charge, while hydride has a -1 charge, resulting in a linear molecular shape.
The molecular geometry of a molecule with the keyword "bro3" according to the VSEPR theory is trigonal pyramidal.
The correct molecular formula if a molecule has 6 carbons is : C6. The 'C' is the symbol for carbon and the little '6' tells us that there are 6 carbons in a particular molecule.
The molecular geometry of a nitrogen molecule is linear.
The most common molecule in a molecular cloud is molecular hydrogen (H2).
molecule
the bond within the molecule is called molecular bond
Ethanol is a covalent molecule with the formula, CH3CH2OH and hence it is molecular.
The molecular geometry of the CF3H molecule, based on its Lewis structure, is trigonal pyramidal.
The molecular orbital diagram should be used to analyze the bonding in the molecule.
The molecular formula specifies the actual number of atoms of each element in a molecule.
Linear
a square
A Molecular Substance or Compound.
The molecular shape of a magnesium hydride molecule is linear. Magnesium has a +2 charge, while hydride has a -1 charge, resulting in a linear molecular shape.