Answer
a.) 1,2-dicholoroethane & 1,1-dicholoroethane
b.) 1-propanol, 2-propanol (a.k.a. isopropyl alcohol) & methoxyethane
c.) 1-propene & cyclopropane
The lewis structures can be found in the image below.
Work Step by Step
1. Try to determine the type of organic compound based on the given molecular formula (Tip: You can use the generic formulas of organic compounds as a "cheat sheet").
Alkanes: $C_{n}H_{2n+2}$.
Alkenes: $C_{n}H_{2n}$.
Alkynes: $C_{n}H_{2n-2}$.
Arenes: $C_{n}H_{n}$.
Alcohols: $C_{n}H_{2n+2}OH$.
2. After determining the type of organic compound, begin by drawing the simplest lewis structure possible.
3. Using the simplest lewis structure you have made, try rearranging some atoms to make a new compound (Tip: if present, try moving the oxygen atom or the -OH group).
4. Finally, check if the newly rearranged compound is different from the previous one.
5. Repeat these steps until there are no more possible isomers to be formed.
