Question 91:
Which of the following is a characteristic reaction of phenols?
A) Electrophilic aromatic substitution
B) Nucleophilic substitution
C) Elimination
D) Addition
Answer: A) Electrophilic aromatic substitution
Explanation: Phenols readily undergo electrophilic aromatic substitution due to the electron-donating nature of the hydroxyl group, which activates the aromatic ring.
Question 92:
What type of alcohol can be synthesized from the reduction of an aldehyde?
A) Primary alcohol
B) Secondary alcohol
C) Tertiary alcohol
D) None of the above
Answer: A) Primary alcohol
Explanation: Aldehydes are reduced to primary alcohols, whereas ketones yield secondary alcohols.
Question 93:
Which of the following methods can be used to synthesize ethers?
A) Williamson ether synthesis
B) Alkyl halide and alcohol reaction
C) Dehydration of alcohols
D) All of the above
Answer: D) All of the above
Explanation: All of these methods can be employed to synthesize ethers from appropriate reactants.
Question 94:
Which of the following compounds is an example of a tertiary alcohol?
A) 1-Pentanol
B) 2-Pentanol
C) 2-Methyl-2-butanol
D) 1-Butanol
Answer: C) 2-Methyl-2-butanol
Explanation: 2-Methyl-2-butanol has the -OH group attached to a carbon that is bonded to three other carbon atoms, classifying it as a tertiary alcohol.
Question 95:
What is a common use of phenol in the industry?
A) Fuel
B) Plastic production
C) Antibiotics
D) Food preservation
Answer: B) Plastic production
Explanation: Phenol is widely used in the production of plastics, particularly Bakelite and other phenolic resins.
Question 96:
Which of the following reactions is characteristic of alcohols?
A) Nucleophilic addition
B) Electrophilic addition
C) Nucleophilic substitution
D) Electrophilic substitution
Answer: C) Nucleophilic substitution
Explanation: Alcohols can undergo nucleophilic substitution reactions, particularly when converted to better leaving groups.
Question 97:
What is formed when a phenol is treated with sodium hydroxide?
A) Sodium phenoxide
B) Sodium salicylate
C) Phenyl ether
D) None of the above
Answer: A) Sodium phenoxide
Explanation: The reaction between phenol and sodium hydroxide results in the formation of sodium phenoxide through deprotonation.
Question 98:
Which of the following statements about ethers is TRUE?
A) They are polar compounds.
B) They can form hydrogen bonds with each other.
C) They have higher boiling points than alcohols of similar molecular weight.
D) They are more reactive than alcohols.
Answer: A) They are polar compounds.
Explanation: Ethers are polar due to the electronegative oxygen atom, but they do not form hydrogen bonds with each other.
Question 99:
Which of the following is a property of alcohols?
A) They are flammable.
B) They have low boiling points.
C) They are non-soluble in water.
D) They do not participate in redox reactions.
Answer: A) They are flammable.
Explanation: Alcohols are flammable compounds, but they generally have higher boiling points than hydrocarbons of similar molecular weight and are usually soluble in water due to their hydroxyl groups.
Question 100:
What is the primary product when a secondary alcohol is oxidized?
A) Alcohol
B) Ketone
C) Aldehyde
D) Ether
Answer: B) Ketone
Explanation: The oxidation of a secondary alcohol typically results in the formation of a ketone.
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