Shapes of molecules can all be explained using the EPRT:
- BeCl2 and CO2 are linear
- BCl3 is trigonal planar
- CH4 is tetrahedral
- NH3 is tetrahedral (lone pair)
- NH4+ is tetrahedral (with a +1 charge)
- H2O is bent linear (two lone pairs)
All the C atoms have a tetrahedral arrangement around them in the Alkanes and Halogenoalkanes.
In an Alkene eg Ethene, the two C atoms have 3 bonds arranged in the same plane at an angle of about 120'
In Alcohols, the O has 2 lone pairs like in H2O, so bent linear C--O--H
In a Carboxylic acid the --COOH carboxyl group is planar.
In Aldehydes and Ketones the Carbonyl group C=O is planar with 120' bond angles.
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