Alcohols & Phenols

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Q1. Which reagent is commonly used to test for the presence of phenols?

Solution:

Bromine water is used to test for phenols, as they will decolorize bromine water.

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Q2. What is the product of the oxidation of a primary alcohol? (2020) 2020

Solution:

The oxidation of a primary alcohol first produces an aldehyde, which can further oxidize to a carboxylic acid.

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Q3. What is the functional group of phenols? (2021)

Solution:

Phenols contain a hydroxyl group (-OH) directly attached to an aromatic hydrocarbon group.

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Q4. Which of the following compounds is not an alcohol? (2023) 2023

Solution:

Phenol is not classified as an alcohol because it has an aromatic ring, while the others are aliphatic alcohols.

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Q5. Which of the following is a primary alcohol? (2022) 2022

Solution:

1-butanol has the hydroxyl group (-OH) attached to a primary carbon atom, making it a primary alcohol.

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Q6. What is the functional group present in phenols? (2021)

Solution:

Phenols contain a hydroxyl group (-OH) directly attached to an aromatic hydrocarbon group.

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Q7. Which alcohol is used as an antifreeze? (2022)

Solution:

Methanol is commonly used as an antifreeze due to its low freezing point.

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Q8. Which alcohol is commonly known as rubbing alcohol?

Solution:

Isopropanol, or 2-Propanol, is commonly referred to as rubbing alcohol.

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Q9. Which reagent is used to convert an alcohol to an alkyl halide? (2023) 2023

Solution:

PCl5 is commonly used to convert alcohols to alkyl halides through a substitution reaction.

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Q10. What is the main reaction of phenols with bromine water? (2020)

Solution:

Phenols react with bromine water to form brominated phenols, which are usually colorless or pale yellow.