Question 31:
What is the product of the reaction between phenol and sodium metal?
A) Sodium phenoxide
B) Ether
C) Alkane
D) Benzene
Answer: A) Sodium phenoxide
Explanation: When phenol reacts with sodium metal, it forms sodium phenoxide through the deprotonation of phenol, which is a characteristic reaction.
Question 32:
Which type of alcohol can be readily converted to an alkene via dehydration?
A) Primary alcohol
B) Secondary alcohol
C) Tertiary alcohol
D) All of the above
Answer: D) All of the above
Explanation: All types of alcohols can undergo dehydration, but tertiary alcohols typically do so more readily due to the stability of the carbocation intermediate.
Question 33:
Which of the following statements about ethers is FALSE?
A) Ethers are generally non-polar.
B) Ethers can form hydrogen bonds with water.
C) Ethers have lower boiling points than alcohols of similar molecular weight.
D) Ethers are more stable than alcohols.
Answer: B) Ethers can form hydrogen bonds with water.
Explanation: Ethers cannot form hydrogen bonds with themselves or water due to the absence of hydrogen attached to an electronegative atom. They are, however, soluble in water due to their polarity.
Question 34:
Which of the following is a method to synthesize ethers?
A) Refluxing an alcohol with an alkyl halide
B) Dehydration of alcohols
C) Williamson ether synthesis
D) Both A and C
Answer: D) Both A and C
Explanation: Both the reaction of alcohols with alkyl halides and the Williamson ether synthesis are common methods for synthesizing ethers.
Question 35:
Which reagent would convert a primary alcohol to an aldehyde?
A) H2SO4
B) KMnO4
C) PCC (Pyridinium chlorochromate)
D) NaBH4
Answer: C) PCC (Pyridinium chlorochromate)
Explanation: PCC is a mild oxidizing agent that selectively oxidizes primary alcohols to aldehydes without further oxidation to carboxylic acids.
Question 36:
What type of reaction occurs when an alcohol reacts with a strong acid like H2SO4?
A) Nucleophilic substitution
B) Dehydration
C) Hydrolysis
D) Reduction
Answer: B) Dehydration
Explanation: When an alcohol reacts with a strong acid like H2SO4, it can undergo dehydration to form an alkene through the elimination of water.
Question 37:
Which of the following compounds is not a phenol?
A) Resorcinol
B) Hydroquinone
C) Cresol
D) Anisole
Answer: D) Anisole
Explanation: Anisole is an ether (methoxybenzene) and does not have the hydroxyl (-OH) group characteristic of phenols, while the other options are phenolic compounds.
Question 38:
Which of the following compounds can be oxidized to a carboxylic acid?
A) 2-Pentanol
B) 1-Butanol
C) 2-Butanol
D) 2-Methyl-2-propanol
Answer: B) 1-Butanol
Explanation: 1-Butanol is a primary alcohol that can be oxidized to a carboxylic acid (butanoic acid), while the others are either secondary alcohols or tertiaries that cannot be oxidized to carboxylic acids.
Question 39:
Which of the following alcohols is the least acidic?
A) Methanol
B) Ethanol
C) 1-Butanol
D) 2-Methyl-2-propanol
Answer: D) 2-Methyl-2-propanol
Explanation: 2-Methyl-2-propanol (tert-butyl alcohol) is the least acidic among the options due to the steric hindrance and stability of its conjugate base, which is less favorable compared to the others.
Question 40:
What is the primary product of the reaction between an alcohol and a carboxylic acid in the presence of sulfuric acid?
A) Ether
B) Ester
C) Alcohol
D) Aldehyde
Answer: B) Ester
Explanation: The reaction between an alcohol and a carboxylic acid in the presence of sulfuric acid produces an ester through a process known as esterification.
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