Hydrocarbons - Reaction Mechanisms
Q. In the reaction of cyclohexene with H2 in the presence of a catalyst, what is the expected product?
A.
Cyclohexane
B.
Hexane
C.
Cyclohexanol
D.
1-hexene
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Solution
The hydrogenation of cyclohexene in the presence of a catalyst leads to the formation of cyclohexane.
Correct Answer: A — Cyclohexane
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Q. What is the expected product when 2-methylpropene undergoes hydroboration-oxidation?
A.
2-methylpropan-1-ol
B.
2-methylpropan-2-ol
C.
2-methylpropanoic acid
D.
2-methylpropene
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Solution
Hydroboration-oxidation of 2-methylpropene leads to the formation of 2-methylpropan-1-ol due to anti-Markovnikov addition of water.
Correct Answer: A — 2-methylpropan-1-ol
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Q. What is the IUPAC name for the compound CH3-CH2-CH(CH3)-CH2-CH3?
A.
2-pentene
B.
3-pentanol
C.
3-methylpentane
D.
2-methylpentane
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Solution
The longest carbon chain has five carbons, and the methyl group is on the third carbon, making the IUPAC name 3-methylpentane.
Correct Answer: C — 3-methylpentane
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Q. What is the IUPAC name for the compound with the formula C2H4Cl2?
A.
1,1-dichloroethane
B.
1,2-dichloroethane
C.
2,2-dichloroethane
D.
Chloroethane
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Solution
The compound C2H4Cl2 has two chlorine atoms on the second carbon of the ethane chain, making its IUPAC name 1,2-dichloroethane.
Correct Answer: B — 1,2-dichloroethane
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Q. What is the major product of the reaction between 1-butene and HBr?
A.
1-bromobutane
B.
2-bromobutane
C.
3-bromobutane
D.
butane
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Solution
The reaction follows Markovnikov's rule, where HBr adds across the double bond, leading to the formation of 2-bromobutane as the major product.
Correct Answer: B — 2-bromobutane
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Q. What is the major product when 2-methylpropene reacts with H2 in the presence of a catalyst?
A.
2-methylpropane
B.
2-methylpropan-1-ol
C.
Propane
D.
2-methylpropan-2-ol
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Solution
The hydrogenation of 2-methylpropene results in the saturation of the double bond, yielding 2-methylpropane as the major product.
Correct Answer: A — 2-methylpropane
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Q. What is the product of the reaction of 1-pentyne with H2 in the presence of Lindlar's catalyst?
A.
Pentane
B.
1-pentene
C.
2-pentene
D.
1-butyne
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Solution
Lindlar's catalyst selectively hydrogenates alkynes to alkenes, resulting in the formation of cis-2-pentene from 1-pentyne.
Correct Answer: C — 2-pentene
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Q. What type of stereoisomerism is exhibited by 2-butene?
A.
Geometric isomerism
B.
Optical isomerism
C.
Conformational isomerism
D.
Structural isomerism
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Solution
2-butene exhibits geometric isomerism (cis/trans) due to the restricted rotation around the double bond.
Correct Answer: A — Geometric isomerism
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Q. Which functional group is present in the compound CH3-CH2-COOH?
A.
Alcohol
B.
Aldehyde
C.
Carboxylic acid
D.
Ketone
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Solution
The compound CH3-CH2-COOH contains a carboxylic acid functional group, characterized by the -COOH group.
Correct Answer: C — Carboxylic acid
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Q. Which mechanism is primarily involved in the reaction of alkenes with bromine?
A.
Electrophilic addition
B.
Nucleophilic substitution
C.
Radical substitution
D.
Elimination
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Solution
The reaction of alkenes with bromine involves an electrophilic addition mechanism, where the alkene acts as a nucleophile and attacks the electrophilic bromine molecule.
Correct Answer: A — Electrophilic addition
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Q. Which of the following compounds is a primary alkyl halide?
A.
1-bromobutane
B.
2-bromobutane
C.
3-bromobutane
D.
1-bromo-2-methylpropane
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Solution
1-bromobutane is a primary alkyl halide because the carbon bonded to the bromine is attached to only one other carbon.
Correct Answer: A — 1-bromobutane
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Q. Which of the following compounds is an example of a cycloalkane?
A.
C6H12
B.
C5H10
C.
C4H8
D.
C3H6
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Solution
Cycloalkanes are saturated hydrocarbons with a ring structure. C6H12 represents cyclohexane, which is a cycloalkane.
Correct Answer: A — C6H12
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Q. Which of the following is a characteristic reaction of alkynes?
A.
Hydrogenation
B.
Hydrohalogenation
C.
Halogenation
D.
All of the above
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Solution
Alkynes can undergo hydrogenation, hydrohalogenation, and halogenation reactions, making all of the above options characteristic reactions.
Correct Answer: D — All of the above
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