31. Which of the following compounds has a cyclic structure?
a) Ethane
b) Cyclopropane
c) Butane
d) Propene
Answer: b) Cyclopropane
Explanation: Cyclopropane is a cyclic compound consisting of three carbon atoms arranged in a ring.
32. Which of the following is not a property of alkanes?
a) Non-polar
b) Saturated
c) Generally unreactive
d) Highly soluble in water
Answer: d) Highly soluble in water
Explanation: Alkanes are non-polar and generally unreactive, and they are not soluble in water due to their hydrophobic nature.
33. Which of the following hydrocarbons can undergo electrophilic aromatic substitution?
a) Ethylene
b) Propane
c) Toluene
d) Cyclobutane
Answer: c) Toluene
Explanation: Toluene, as an aromatic compound, can undergo electrophilic aromatic substitution reactions, while alkenes and alkanes do not.
34. What is the IUPAC name of the compound with the formula C₆H₅-CHO?
a) Benzene
b) Benzaldehyde
c) Benzoic acid
d) Phenol
Answer: b) Benzaldehyde
Explanation: The compound C₆H₅-CHO is named benzaldehyde, which contains a formyl group (-CHO) attached to a benzene ring.
35. Which of the following compounds is a diene?
a) 1-Butene
b) 2-Butyne
c) 1,3-Butadiene
d) Cyclobutene
Answer: c) 1,3-Butadiene
Explanation: 1,3-Butadiene is a compound containing two double bonds, making it a diene.
36. Which of the following compounds exhibits resonance?
a) Ethylene
b) Acetylene
c) Benzene
d) 1-Butene
Answer: c) Benzene
Explanation: Benzene exhibits resonance due to its delocalized π electrons, resulting in equal bond lengths and strengths around the ring.
37. Which reaction involves the addition of hydrogen halides to alkenes?
a) Hydration
b) Hydrogenation
c) Hydrohalogenation
d) Halogenation
Answer: c) Hydrohalogenation
Explanation: Hydrohalogenation involves the addition of hydrogen halides (HX) to alkenes, forming haloalkanes.
38. Which of the following is the product of the catalytic hydrogenation of 1-butyne?
a) Butane
b) Butene
c) Butanol
d) Butadiene
Answer: b) Butene
Explanation: The catalytic hydrogenation of 1-butyne results in butene, as it adds hydrogen across the triple bond, forming a double bond.
39. Which of the following compounds is an example of a secondary alcohol?
a) Methanol
b) Ethanol
c) Isopropanol
d) Butanol
Answer: c) Isopropanol
Explanation: Isopropanol (2-propanol) is a secondary alcohol, as the hydroxyl (-OH) group is attached to a carbon atom that is connected to two other carbon atoms.
40. Which of the following compounds will have the lowest boiling point?
a) Hexane
b) Heptane
c) Octane
d) 2-Methylhexane
Answer: a) Hexane
Explanation: Among the given options, hexane has the lowest boiling point due to its shorter carbon chain length compared to the others.
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