an -ol suffix indicates that an -OH group has been added to a hydrocarbon. Which formula represents 1,2-ethanediol?

1 C2H4(OH)2
2 C3H5(OH)3
3 Ca(OH)2
4 Co(OH)3

1 C2H4(OH)2

The formula for 1,2-ethanediol is C2H4(OH)2. Therefore, the answer is option 1.

To determine which formula represents 1,2-ethanediol, we need to understand the naming convention for organic compounds.

The "-ol" suffix indicates the presence of an alcohol functional group, which consists of an -OH group attached to a carbon atom.

The name "1,2-ethanediol" indicates that there are two -OH groups attached to carbon atoms 1 and 2 of the ethane molecule.

Now let's analyze the given options:

1. C2H4(OH)2: This formula represents ethylene glycol, which has two -OH groups attached to the ethane molecule. It matches the given name, so this could be the correct option.

2. C3H5(OH)3: This formula does not match the given name "1,2-ethanediol." It represents a compound with three carbon atoms and three -OH groups. Therefore, it is not the correct option.

3. Ca(OH)2: This formula represents calcium hydroxide, which is not an organic compound. It does not match the given name, so it is not the correct option.

4. Co(OH)3: This formula represents cobalt(III) hydroxide, which is also not an organic compound. It does not match the given name, so it is not the correct option.

Based on the analysis, option 1, C2H4(OH)2, represents 1,2-ethanediol, making it the correct answer.

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