Organic Chemistry - Alcohols, Phenols & Ethers

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Q1. Which of the following statements about alcohols is correct? (2022)

Solution:

Alcohols have higher boiling points than alkanes due to the presence of hydrogen bonding.

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Q2. Which of the following is the correct IUPAC name for CH3-CH2-CH(OH)-CH3? (2020)

Solution:

The compound CH3-CH2-CH(OH)-CH3 is 2-butanol, as the hydroxyl group is on the second carbon.

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Q3. What type of reaction occurs when an alcohol is oxidized? (2023)

Solution:

Oxidation of alcohols involves the loss of hydrogen or the gain of oxygen, leading to the formation of aldehydes, ketones, or carboxylic acids.

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Q4. Which of the following is a characteristic of ethers? (2019)

Solution:

Ethers generally have lower boiling points than alcohols due to the absence of hydrogen bonding.

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Q5. Which of the following is the correct method to prepare phenol? (2022)

Solution:

Phenol can be prepared by the hydrolysis of chlorobenzene using sodium hydroxide.

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Q6. What type of reaction occurs when phenol reacts with bromine? (2023)

Solution:

Phenol undergoes electrophilic substitution when it reacts with bromine, resulting in brominated phenols.

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Q7. Which of the following alcohols is most soluble in water? (2022)

Solution:

2-butanol has a higher solubility in water due to its ability to form hydrogen bonds more effectively than the others.

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Q8. Which of the following is the simplest ether? (2020)

Solution:

Dimethyl ether (CH3-O-CH3) is the simplest ether, consisting of two methyl groups bonded to an oxygen atom.

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Q9. Which of the following statements is true about phenols? (2023)

Solution:

Phenols are stronger acids than alcohols due to the resonance stabilization of the phenoxide ion.

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Q10. Which reagent is used to convert an alcohol into an alkyl halide? (2022)

Solution:

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