131. What is the product when ethanol reacts with acetic acid in the presence of an acid catalyst?
a) Ethyl acetate
b) Acetaldehyde
c) Acetone
d) Ethyl alcohol
Answer: a) Ethyl acetate
Explanation: The reaction between ethanol and acetic acid in the presence of an acid catalyst forms an ester, specifically ethyl acetate.
132. Which of the following is used in the preparation of alcoholic beverages?
a) Fermentation
b) Hydrogenation
c) Dehydration
d) Oxidation
Answer: a) Fermentation
Explanation: Fermentation of sugars is used in the preparation of alcoholic beverages, producing ethanol.
133. Which of the following alcohols is the most toxic when ingested?
a) Methanol
b) Ethanol
c) Propanol
d) Isopropanol
Answer: a) Methanol
Explanation: Methanol is highly toxic when ingested, as it is metabolized to formic acid and formaldehyde, leading to serious poisoning.
134. What is the purpose of the iodine test in alcohol chemistry?
a) To test for the presence of a hydroxyl group
b) To test for the presence of a methyl ketone or alcohol with the structure CH₃CH(OH)-
c) To detect the acidity of alcohols
d) To identify primary alcohols
Answer: b) To test for the presence of a methyl ketone or alcohol with the structure CH₃CH(OH)-
Explanation: The iodoform test detects compounds with the structure CH₃CH(OH)- or methyl ketones, resulting in a yellow precipitate of iodoform.
135. Which of the following alcohols would react fastest with Lucas reagent?
a) 1-Butanol
b) 2-Butanol
c) 2-Methyl-2-propanol
d) 1-Propanol
Answer: c) 2-Methyl-2-propanol
Explanation: Tertiary alcohols like 2-methyl-2-propanol react the fastest with Lucas reagent, producing a cloudy solution almost immediately.
136. Which of the following reactions would produce ethanol?
a) Hydration of ethene
b) Dehydration of ethanol
c) Oxidation of ethanol
d) Reduction of ethanal
Answer: a) Hydration of ethene
Explanation: The hydration of ethene results in the formation of ethanol via the addition of water across the double bond of ethene.
137. What happens when ethanol is heated with potassium permanganate?
a) Ethanol is reduced to acetaldehyde.
b) Ethanol is oxidized to acetic acid.
c) Ethanol undergoes dehydration to form ethene.
d) Ethanol is reduced to methane.
Answer: b) Ethanol is oxidized to acetic acid.
Explanation: Ethanol is oxidized to acetic acid when heated with a strong oxidizing agent like potassium permanganate (KMnO₄).
138. What type of reaction occurs when ethanol reacts with sodium metal?
a) Oxidation
b) Elimination
c) Substitution
d) Redox
Answer: d) Redox
Explanation: When ethanol reacts with sodium, a redox reaction occurs, where ethanol donates hydrogen, forming sodium ethoxide and hydrogen gas.
139. What is the IUPAC name of CH₃OH?
a) Methanol
b) Ethanol
c) Propanol
d) Methanal
Answer: a) Methanol
Explanation: The IUPAC name of CH₃OH is methanol, where “meth-” refers to the single carbon atom and “-anol” indicates the hydroxyl group.
140. Which of the following reagents can be used to reduce an alcohol to an alkane?
a) NaBH₄
b) H₂SO₄
c) Zn/HCl
d) PCC
Answer: c) Zn/HCl
Explanation: The combination of zinc and hydrochloric acid can reduce alcohols to alkanes through a reduction process.
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