Question 11:
Which type of ether is most commonly used as an anesthetic?
A) Diethyl ether
B) Methyl ethyl ether
C) Phenyl ether
D) Tetrahydrofuran
Answer: A) Diethyl ether
Explanation: Diethyl ether has historically been used as an anesthetic due to its volatility and ability to induce anesthesia.
Question 12:
What happens when a phenol is treated with a strong base like NaOH?
A) Formation of an ether
B) Formation of a phenoxide ion
C) Formation of a diol
D) No reaction
Answer: B) Formation of a phenoxide ion
Explanation: When phenol reacts with a strong base like NaOH, it deprotonates to form a phenoxide ion, which is more reactive than phenol.
Question 13:
What is the product of the reaction between a primary alcohol and a carboxylic acid in the presence of an acid catalyst?
A) Ether
B) Ester
C) Aldehyde
D) Ketone
Answer: B) Ester
Explanation: The reaction of a primary alcohol with a carboxylic acid in the presence of an acid catalyst leads to the formation of an ester through a process called esterification.
Question 14:
Which of the following compounds would be classified as a tertiary alcohol?
A) 1-Butanol
B) 2-Butanol
C) 2-Methyl-1-propanol
D) 2-Methyl-2-propanol
Answer: D) 2-Methyl-2-propanol
Explanation: Tertiary alcohols have the -OH group attached to a carbon atom that is connected to three other carbon atoms. In 2-methyl-2-propanol, the -OH group is attached to a carbon that is connected to three other carbons.
Question 15:
Which of the following compounds is an aromatic ether?
A) Dimethyl ether
B) Phenyl ethyl ether
C) Diethyl ether
D) Propylene glycol
Answer: B) Phenyl ethyl ether
Explanation: Phenyl ethyl ether contains a phenyl group bonded to an ether oxygen, making it an aromatic ether. The other options do not contain aromatic groups.
Question 16:
What is the result of the reaction of alcohol with acetic anhydride?
A) Ester
B) Ether
C) Aldehyde
D) Ketone
Answer: A) Ester
Explanation: When an alcohol reacts with acetic anhydride, it forms an acetate ester through an acylation reaction.
Question 17:
Which statement is true about the boiling points of alcohols compared to ethers?
A) Alcohols have lower boiling points than ethers.
B) Alcohols have higher boiling points than ethers due to hydrogen bonding.
C) Ethers and alcohols have similar boiling points.
D) Ethers have higher boiling points than alcohols.
Answer: B) Alcohols have higher boiling points than ethers due to hydrogen bonding.
Explanation: Alcohols can form hydrogen bonds due to the presence of -OH groups, leading to higher boiling points compared to ethers, which cannot hydrogen bond in the same way.
Question 18:
Which of the following compounds is a strong acid?
A) Ethanol
B) Phenol
C) Methanol
D) Tertiary butyl alcohol
Answer: B) Phenol
Explanation: Phenol is more acidic than the other options due to the stabilization of its conjugate base (phenoxide ion) by resonance. Ethanol, methanol, and tertiary butyl alcohol are much weaker acids.
Question 19:
What is the main product of the reaction of 1-butanol with HBr?
A) 1-Bromobutane
B) 2-Bromobutane
C) 1-Butene
D) Butyric acid
Answer: A) 1-Bromobutane
Explanation: The reaction of 1-butanol with HBr results in the substitution of the -OH group with a bromine atom, leading to the formation of 1-bromobutane.
Question 20:
Which of the following is a property of ethers?
A) They are polar solvents.
B) They can form hydrogen bonds with themselves.
C) They have higher boiling points than alcohols.
D) They are generally less reactive than alcohols.
Answer: D) They are generally less reactive than alcohols.
Explanation: Ethers are relatively inert compared to alcohols and do not readily participate in reactions such as oxidation or dehydration.
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