Predict the geometry and shape of each of the following molecules.
(i) `HC -= CH`
(ii) `CH_(3)Cl`
(iii) `H_(2)C = O`
Strategy: `sp^(3)` hybridization can always be correlated to tetrahedral geometry, `sp^(2)` hybridization to trigonal planar geometry, and `sp` hybridization to linear geometry.

Explanation

(i) `sp` hybridization carbon atoms, linear geometry and shape.
(ii) `sp^(3)` hybridized carbon, tetrahedral geometry and shape.
(iii) `sp^(2)` hybridized carbon, trigonal planar geometry and shape.