Build each molecule below starting from elements in their rtb form. ii) Then, determine their 3-D geometry (linear, trigonal planar, tetrahedral) and redraw the molecule in the correct 3-D form.

a.Methane, CH4, tetrahedral shape

b.Ammonia, NH3, tetrahedral

c.Water, H2O, tetrahedral shape

d.Ethylene, CH2=CH2, trigonal planar shape

e.Formaldehyde, CH2=O, trigonal planar shape

f.Methyl carbocation, CH3+, trigonal planar shape

g.Acetylene, HC(tpb)CH, linear shape (where tpb is triple bond)

h.Carbon dioxide, CO2, linear shape

i.Allene, CH2=C=CH2, linear shape.