Question:
Which of the following contains 2 primary –OH groups in its structure?
Which of the following contains 2 primary –OH groups in its structure?
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A primary alcohol group is attached to a carbon that is connected to only one other carbon. In contrast, a secondary alcohol group is connected to two other carbons.
Updated On: Apr 28, 2025
- Glycerol
- Ethylene glycol
- Isopropyl alcohol
- Ethanoic Acid
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The Correct Option is B
Solution and Explanation
Ethylene glycol (C\(_2\)H\(_6\)O\(_2\)) contains two primary alcohol groups, meaning two –OH groups are attached to two different carbon atoms, and each carbon is attached to one other carbon atom (making them primary alcohols). The structure of glycerol contains three hydroxyl groups attached to different carbons, but two of these carbons are secondary alcohols because they are bonded to two other carbons. Isopropyl alcohol (C\(_3\)H\(_7\)OH) only has one primary alcohol group and a secondary alcohol group.
Thus, Ethylene glycol is the correct answer because it contains two primary –OH groups.
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Alcohols undergo a number of reactions involving the cleavage of C – OH bond. However, phenols do not undergo reactions involving the cleavage of C – OH bond. Alcohols are weaker acids than water. Alcohols react with halogen acids to form the corresponding haloaklanes. Phenols are stronger acids than alcohols. A charac- teristic feature of phenols is that they undergo electrophilic substitution reactions such as halogenation, nitration, etc. Since –OH group is a strong activating group, phenol gives trisubstituted products during halogenation, nitration, etc.
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