Question 81:
Which of the following is a property of ethers?
A) They are highly polar.
B) They can form hydrogen bonds with themselves.
C) They have higher boiling points than alcohols of similar molecular weight.
D) They are generally unreactive.
Answer: D) They are generally unreactive.
Explanation: Ethers are relatively unreactive compared to alcohols and can be considered stable under many conditions, though they can react with strong acids.
Question 82:
What is the primary product when phenol reacts with acetic anhydride?
A) Acetophenone
B) Anisole
C) Acetic acid
D) Benzene
Answer: A) Acetophenone
Explanation: The reaction of phenol with acetic anhydride produces acetophenone through the acylation of the phenolic hydroxyl group.
Question 83:
What is the main product of the reaction between 1-butanol and HCl?
A) Butyl chloride
B) Butyl ether
C) Butanal
D) Butanoic acid
Answer: A) Butyl chloride
Explanation: The reaction of 1-butanol with HCl results in the substitution of the hydroxyl group by a chlorine atom, yielding butyl chloride.
Question 84:
Which alcohol is formed when 2-methylpropene undergoes hydration?
A) 1-Butanol
B) 2-Butanol
C) 2-Methyl-2-propanol
D) Ethanol
Answer: B) 2-Butanol
Explanation: The hydration of 2-methylpropene via Markovnikov’s rule yields 2-butanol as the main product.
Question 85:
Which of the following compounds can be classified as a primary alcohol?
A) 2-Pentanol
B) 1-Hexanol
C) 2-Methyl-2-butanol
D) Cyclohexanol
Answer: B) 1-Hexanol
Explanation: 1-Hexanol has the -OH group attached to a carbon at the end of the chain, making it a primary alcohol.
Question 86:
What is the product when isopropanol (2-propanol) is oxidized?
A) Propanol
B) Acetone
C) Propylene
D) Propionic acid
Answer: B) Acetone
Explanation: Isopropanol (a secondary alcohol) is oxidized to acetone (a ketone) during the oxidation process.
Question 87:
Which reagent can convert an alcohol to an alkyl iodide?
A) HI
B) PBr3
C) SOCl2
D) Both A and B
Answer: A) HI
Explanation: Hydroiodic acid (HI) can convert alcohols to alkyl iodides through a nucleophilic substitution reaction.
Question 88:
Which of the following compounds is a strong acid?
A) Ethanol
B) Phenol
C) 2-Methyl-2-propanol
D) 1-Pentanol
Answer: B) Phenol
Explanation: Phenol is more acidic than simple alcohols due to the resonance stabilization of its conjugate base (phenoxide ion).
Question 89:
Which of the following is an example of a phenolic antioxidant?
A) BHT (Butylated hydroxytoluene)
B) Tert-Butanol
C) Ethanol
D) Methanol
Answer: A) BHT (Butylated hydroxytoluene)
Explanation: BHT is a synthetic antioxidant used to prevent oxidation in food products and is derived from phenolic compounds.
Question 90:
Which reagent is commonly used to convert an alcohol to a sulfonate ester?
A) TsCl (p-toluenesulfonyl chloride)
B) SOCl2
C) HCl
D) PCl3
Answer: A) TsCl (p-toluenesulfonyl chloride)
Explanation: TsCl is used to convert alcohols into sulfonate esters, making them better leaving groups for further reactions.
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