Question 41:
Which of the following compounds is a secondary alcohol?
A) 1-Propanol
B) 2-Propanol
C) 2-Methyl-1-propanol
D) 1-Hexanol
Answer: B) 2-Propanol
Explanation: 2-Propanol (isopropyl alcohol) is a secondary alcohol because the -OH group is attached to a carbon that is connected to two other carbon atoms.
Question 42:
Which of the following methods can be used to convert an alcohol into an alkene?
A) Dehydration
B) Reduction
C) Oxidation
D) Halogenation
Answer: A) Dehydration
Explanation: Dehydration of an alcohol involves the elimination of water, resulting in the formation of an alkene.
Question 43:
Which of the following is a characteristic of phenolic compounds?
A) They are always neutral.
B) They are weak acids.
C) They cannot be oxidized.
D) They are soluble in hydrocarbons.
Answer: B) They are weak acids.
Explanation: Phenolic compounds can donate protons (H+) and are therefore classified as weak acids due to the resonance stabilization of their phenoxide ions.
Question 44:
Which reagent can be used to convert an alcohol to a ketone?
A) H2SO4
B) Na2Cr2O7
C) PCC
D) Both B and C
Answer: D) Both B and C
Explanation: Both Na2Cr2O7 (chromic acid) and PCC can oxidize secondary alcohols to ketones.
Question 45:
What happens when a primary alcohol is treated with an excess of potassium permanganate?
A) It remains unchanged.
B) It is oxidized to an aldehyde.
C) It is oxidized to a carboxylic acid.
D) It is reduced to an alkane.
Answer: C) It is oxidized to a carboxylic acid.
Explanation: Excess potassium permanganate can fully oxidize a primary alcohol to a carboxylic acid.
Question 46:
Which of the following compounds would react most readily with a nucleophile?
A) Alcohol
B) Ether
C) Aldehyde
D) Ketone
Answer: C) Aldehyde
Explanation: Aldehydes are more electrophilic than ketones due to less steric hindrance and have a carbonyl carbon that is more susceptible to nucleophilic attack.
Question 47:
Which type of reaction is used to synthesize ethers from alcohols?
A) Substitution
B) Elimination
C) Addition
D) Condensation
Answer: D) Condensation
Explanation: The formation of ethers from two alcohols typically occurs through a condensation reaction, where water is eliminated.
Question 48:
What type of alcohol is most likely to undergo oxidation?
A) Primary
B) Secondary
C) Tertiary
D) All of the above
Answer: A) Primary
Explanation: Primary alcohols are more readily oxidized to aldehydes and further to carboxylic acids, whereas tertiary alcohols resist oxidation.
Question 49:
Which of the following compounds would you expect to be the most soluble in water?
A) Octanol
B) Butanol
C) Ethanol
D) 1-Hexanol
Answer: C) Ethanol
Explanation: Ethanol is a short-chain alcohol, which allows for greater hydrogen bonding with water, making it the most soluble compared to the other options.
Question 50:
Which alcohol is used as an antifreeze agent?
A) Methanol
B) Ethanol
C) Isopropanol
D) Butanol
Answer: A) Methanol
Explanation: Methanol is commonly used as an antifreeze agent due to its low freezing point and ability to lower the freezing point of water.
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