141. Which of the following compounds can be classified as a phenolic compound?
a) Ethanol
b) Butanol
c) Resorcinol
d) Glycerol
Answer: c) Resorcinol
Explanation: Resorcinol is a phenolic compound because it contains a hydroxyl group attached to an aromatic ring.
142. Which of the following is the main use of isopropyl alcohol (2-propanol)?
a) As a fuel
b) As an antiseptic
c) As a solvent for paints
d) All of the above
Answer: d) All of the above
Explanation: Isopropyl alcohol is widely used as an antiseptic, solvent for paints, and can also be used as a fuel.
143. What is the primary factor that affects the boiling point of alcohols?
a) Molecular weight
b) Presence of hydrogen bonding
c) Structure of the carbon chain
d) All of the above
Answer: d) All of the above
Explanation: The boiling point of alcohols is affected by molecular weight, hydrogen bonding, and the structure of the carbon chain.
144. Which type of alcohol can form a stable carbocation during a substitution reaction?
a) Primary alcohol
b) Secondary alcohol
c) Tertiary alcohol
d) All alcohols
Answer: c) Tertiary alcohol
Explanation: Tertiary alcohols can form stable carbocations because the positive charge is stabilized by adjacent carbon atoms.
145. Which alcohol is commonly used as a disinfectant in hospitals?
a) Ethanol
b) Isopropanol
c) Methanol
d) Butanol
Answer: b) Isopropanol
Explanation: Isopropanol (isopropyl alcohol) is widely used as a disinfectant in hospitals due to its effectiveness against bacteria and viruses.
146. What is the effect of increasing the number of hydroxyl groups in an alcohol on its solubility in water?
a) Decreases solubility
b) No effect on solubility
c) Increases solubility
d) Increases boiling point only
Answer: c) Increases solubility
Explanation: Increasing the number of hydroxyl groups in an alcohol generally increases its solubility in water due to enhanced hydrogen bonding.
147. Which of the following statements is true regarding the dehydration of alcohols?
a) It is an addition reaction.
b) It requires the presence of a base.
c) It results in the formation of water.
d) It does not require heat.
Answer: c) It results in the formation of water.
Explanation: The dehydration of alcohols is an elimination reaction that results in the formation of water as one of the products.
148. Which of the following alcohols is a straight-chain alcohol?
a) 2-Pentanol
b) 2-Methyl-2-butanol
c) 1-Butanol
d) 2-Butanol
Answer: c) 1-Butanol
Explanation: 1-Butanol is a straight-chain alcohol, while the others have branches in their carbon chains.
149. Which alcohol can be used to produce a sweet-tasting flavor in food products?
a) Ethanol
b) Methanol
c) Propanol
d) Glycerol
Answer: d) Glycerol
Explanation: Glycerol is often used in food products for its sweet taste and is also a humectant that retains moisture.
150. Which of the following processes is used to convert alcohols into alkyl halides?
a) Halogenation
b) Hydrolysis
c) Dehydration
d) Reduction
Answer: a) Halogenation
Explanation: Halogenation involves the reaction of alcohols with halogens or hydrogen halides to convert them into alkyl halides.
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