Questions: Why is -diol part of this compound's name? There are two - OH groups present There are two carbon atoms in the chain Diol is always written when an -OH group is present The compound contains two H atoms

Why is -diol part of this compound's name? There are two - OH groups present There are two carbon atoms in the chain Diol is always written when an -OH group is present The compound contains two H atoms
Transcript text: Why is -diol part of this compound's name? There are two - OH groups present There are two carbon atoms in the chain Diol is always written when an -OH group is present The compound contains two H atoms
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Solution

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Solution Steps

Step 1: Understanding the Term "-diol"

The term "-diol" in organic chemistry nomenclature is used to indicate the presence of two hydroxyl groups (-OH) in a compound. The prefix "di-" means two, and "ol" is the suffix used for alcohols, which contain hydroxyl groups.

Step 2: Analyzing the Options
  • Option 1: "There are two -OH groups present" - This option correctly describes why "-diol" is used, as it indicates the presence of two hydroxyl groups.
  • Option 2: "There are two carbon atoms in the chain" - This is not related to the use of "-diol." The number of carbon atoms is indicated by prefixes like "meth-" for one carbon, "eth-" for two carbons, etc.
  • Option 3: "Diol is always written when an -OH group is present" - This is incorrect because "-diol" specifically refers to two hydroxyl groups, not just one.
  • Option 4: "The compound contains two H atoms" - This is irrelevant to the use of "-diol," as the presence of hydrogen atoms does not determine the use of this term.

Final Answer

The correct reason for the use of "-diol" in the compound's name is that there are two -OH groups present. Therefore, the answer is:

\(\boxed{\text{There are two -OH groups present}}\)

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