How do you draw Lewis structures for C2H4Cl2, C3H8O, and C3H6?

To draw the Lewis structures for the given molecular formulas, we need to consider the arrangement of atoms and the distribution of electrons.

a) C2H4Cl2 – Two Isomers

The molecular formula C2H4Cl2 can represent two different isomers:

1. 1,1-Dichloroethane: In this structure, both chlorine atoms are attached to the same carbon atom. The Lewis structure looks like this:



2. 1,2-Dichloroethane: In this structure, the chlorine atoms are on different carbon atoms. The Lewis structure looks like this:

b) C3H8O – Three Isomers

The molecular formula C3H8O can represent three isomers:

1. Propan-1-ol: A straight-chain alcohol where the hydroxyl group is on the first carbon:



2. Propan-2-ol: A straight-chain alcohol where the hydroxyl group is on the second carbon:



3. Ether (Dimethyl ether): Where an oxygen atom is between two carbon groups:

c) C3H6 – Two Isomers

The molecular formula C3H6 can represent two different isomers:

1. Propene: A straight-chain alkene with a double bond between the first and second carbon atoms:



2. Cyclopropane: A cyclic structure where three carbon atoms form a ring:

In each case, the Lewis structures illustrate the distribution of electrons around atoms and the bonds formed between them, helping to visualize the molecular geometry and functional groups.