111. What type of reaction occurs when an alcohol is converted to an alkyl halide?
a) Substitution
b) Addition
c) Elimination
d) Rearrangement
Answer: a) Substitution
Explanation: The conversion of an alcohol to an alkyl halide typically involves a substitution reaction where the hydroxyl group is replaced by a halogen.
112. Which of the following is true about the reactivity of alcohols?
a) Tertiary alcohols are more reactive than primary alcohols.
b) Primary alcohols are more reactive than tertiary alcohols.
c) Alcohols do not undergo substitution reactions.
d) All alcohols are equally reactive.
Answer: a) Tertiary alcohols are more reactive than primary alcohols.
Explanation: Tertiary alcohols are generally more reactive in substitution reactions due to the greater stability of the carbocation formed during the reaction.
113. Which of the following statements is false regarding alcohols?
a) Alcohols can form esters.
b) Alcohols are polar compounds.
c) Alcohols cannot be dehydrated to alkenes.
d) Alcohols can participate in hydrogen bonding.
Answer: c) Alcohols cannot be dehydrated to alkenes.
Explanation: This statement is false because alcohols can indeed be dehydrated to form alkenes through elimination reactions.
114. What type of alcohol is isopropanol?
a) Primary alcohol
b) Secondary alcohol
c) Tertiary alcohol
d) None of the above
Answer: b) Secondary alcohol
Explanation: Isopropanol (2-propanol) is a secondary alcohol, as the hydroxyl group is attached to a carbon that is bonded to two other carbon atoms.
115. What is the main use of ethanol in the industry?
a) As a solvent
b) As a fuel
c) In beverages
d) All of the above
Answer: d) All of the above
Explanation: Ethanol is used in various industries as a solvent, fuel, and in beverages.
116. Which of the following methods can be used to synthesize alcohols?
a) Hydration of alkenes
b) Reduction of aldehydes and ketones
c) Hydrolysis of alkyl halides
d) All of the above
Answer: d) All of the above
Explanation: Alcohols can be synthesized by various methods, including the hydration of alkenes, reduction of aldehydes and ketones, and hydrolysis of alkyl halides.
117. What is the IUPAC name of the compound CH₃-CH(OH)-CH₃?
a) 1-Propyl alcohol
b) 2-Propanol
c) 3-Propanol
d) Isopropyl alcohol
Answer: b) 2-Propanol
Explanation: The compound CH₃-CH(OH)-CH₃ is named 2-propanol, indicating that the hydroxyl group is on the second carbon of the propyl chain.
118. Which of the following alcohols has the lowest boiling point?
a) Ethanol
b) Propanol
c) Butanol
d) Methanol
Answer: d) Methanol
Explanation: Methanol has the lowest boiling point among the options due to its small size and lower molecular weight compared to the others.
119. What type of functional group do alcohols contain?
a) Carbonyl group
b) Hydroxyl group
c) Carboxyl group
d) Amino group
Answer: b) Hydroxyl group
Explanation: Alcohols contain a hydroxyl group (-OH), which is their defining feature.
120. Which of the following is true about the dehydration of alcohols?
a) It results in the formation of carboxylic acids.
b) It produces alkenes.
c) It occurs only in the presence of strong bases.
d) It does not require heat.
Answer: b) It produces alkenes.
Explanation: The dehydration of alcohols typically results in the formation of alkenes through the elimination of water.
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