Final answer:
The cis-trans isomers of CH3CH=CHCl have the methyl and chlorine groups on the same side for the cis isomer, and on opposite sides for the trans isomer. Lewis structures illustrate the connectivity of the atoms and the arrangement of electrons.
Step-by-step explanation:
To write Lewis structures for the cis-trans isomers of CH3CH=CHCl, you need to start by knowing that cis-trans isomerism is possible when each carbon of the double bond has two different groups attached to it. In this molecule, the double bond occurs between the second and third carbons.
The cis isomer has the methyl group (CH3) and the chlorine (Cl) on the same side of the double bond, while the trans isomer has the CH3 and Cl on opposite sides of the double bond.
For the cis isomer:
H H
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H-C-C=C-Cl
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H H
And for the trans isomer:
H Cl
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H-C-C=C-H
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H H
Remember that Lewis structures not only show the connectivity of atoms but also the placement of the electrons participating in the bond formation.