151. Which of the following is NOT a method for the synthesis of alcohols?
a) Hydration of alkenes
b) Reduction of carboxylic acids
c) Reduction of alkyl halides
d) Oxidation of ketones
Answer: d) Oxidation of ketones
Explanation: The oxidation of ketones does not produce alcohols; instead, it leads to further oxidation products.
152. Which reagent is typically used to perform the conversion of alcohols to ethers?
a) Sodium metal
b) Sulfuric acid
c) Sodium borohydride
d) Hydrogen halides
Answer: b) Sulfuric acid
Explanation: Sulfuric acid can be used as a catalyst to promote the dehydration of alcohols to form ethers.
153. Which of the following alcohols would you expect to be the least reactive in a substitution reaction?
a) 1-Butanol
b) 2-Butanol
c) 2-Methyl-2-propanol
d) Ethanol
Answer: a) 1-Butanol
Explanation: 1-Butanol is a primary alcohol and is generally less reactive in substitution reactions compared to secondary or tertiary alcohols.
154. Which of the following compounds can be reduced to form an alcohol?
a) Carboxylic acid
b) Alkene
c) Aldehyde
d) All of the above
Answer: d) All of the above
Explanation: Carboxylic acids, alkenes, and aldehydes can all be reduced to form alcohols under appropriate conditions.
155. Which alcohol is known for being used in the production of antifreeze and as a solvent?
a) Ethanol
b) Methanol
c) Propanol
d) Butanol
Answer: b) Methanol
Explanation: Methanol is commonly used in the production of antifreeze and as a solvent in various industrial applications.
156. What is the role of hydrogen in the reduction of alcohols?
a) To oxidize the alcohol
b) To reduce the alcohol to an alkane
c) To form a ketone
d) To dehydrate the alcohol
Answer: b) To reduce the alcohol to an alkane
Explanation: In the reduction of alcohols, hydrogen is used to convert them into alkanes.
157. Which of the following is an example of a branched-chain alcohol?
a) Butanol
b) Pentanol
c) 2-Pentanol
d) 1-Butanol
Answer: c) 2-Pentanol
Explanation: 2-Pentanol is a branched-chain alcohol due to the presence of a hydroxyl group on the second carbon of the pentane chain.
158. Which of the following statements is true regarding the oxidation of alcohols?
a) Primary alcohols can only be oxidized to aldehydes.
b) Secondary alcohols can be oxidized to either ketones or aldehydes.
c) Tertiary alcohols can be oxidized to ketones.
d) All alcohols can be oxidized to carboxylic acids.
Answer: d) All alcohols can be oxidized to carboxylic acids.
Explanation: While primary alcohols can be oxidized to aldehydes and further to carboxylic acids, secondary alcohols can be oxidized to ketones, and tertiary alcohols can be oxidized only under strong conditions to carboxylic acids.
159. Which alcohol is used in the preparation of rocket fuel?
a) Ethanol
b) Isopropanol
c) Methanol
d) Butanol
Answer: c) Methanol
Explanation: Methanol is often used in the preparation of certain types of rocket fuel due to its high energy content.
160. Which of the following tests can be used to distinguish between primary, secondary, and tertiary alcohols?
a) Iodoform test
b) Lucas test
c) Tollens’ test
d) Silver nitrate test
Answer: b) Lucas test
Explanation: The Lucas test can be used to distinguish between primary, secondary, and tertiary alcohols based on their reactivity with hydrogen halides.
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