Question

b) Draw the Lewis structure of the following molecule including its proper geometry. CH2CHC(O)CH3 a) Draw a complete orb...


(b) Draw the Lewis structure of the following molecule including its proper geometry. CH2CHC(O)CH3 a) Draw a complete orbital picture of the molecule.

Answer

The structure of the given molecule is 

Chemistry homework question answer, step 1, image 1

 The Lewis structure is used to represents the arrangement of valence electrons around the atoms in a molecule. It shows that bonding between the atoms in the molecule as well as the lone pairs. 

The molecule contains the carbon, oxygen and hydrogen. The carbon has valency is four, oxygen has valency is  two and it has two lone pairs and hydrogen has valency is one. Based on the this the Lewis structure of the given molecule is 

Chemistry homework question answer, step 2, image 1

The valence electrons of the carbons are shown by black dots, also oxygen valence electrons are shown by black dots and the two lone pairs shown by red dots. The valence electron of the hydrogen is shown by cross (x).

            In this molecule the three carbons is in sp2 hybridisation state and one carbon is in sp3 hybridisation state whereas oxygen is in sp2 hybridisation. In sp2 hybridisation the geometry is trigonal planar i.e. the hybrid orbitals are in plane and one unhybridised pi orbital is perpandicular to the other three hybrid orbitals. So, in the C=C two unhybridised pi orbitals are laterally overlaps to form an pi-bond. In the formation of C=O bond, both carbon and oxygen are in sp2 hybridisation. Each carbon and oxygen has one unhybridised pi orbital laterally overlap to form an pi bond between carbon and oxygen. The oxygen is in sp2 hybridisation state. So, it has four non-bonding electrons which occupies in the two unhybridised orbitals. 

                  The terminal methyl carbon is in sp3 hybridisation state. Its geometry is tetrahedral. The sp3 hybridised carbon makes an new sigma bond with sp2 carbon of the carbonyl carbon and other three hybrid orbitals axial overlaps with the three s-orbitals of the three hydrogen. 

 

Chemistry homework question answer, step 2, image 2

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