Q. What is the effect of increasing the number of alkyl substituents on the stability of alkenes?
A.
Increases stability
B.
Decreases stability
C.
No effect
D.
Depends on the type of alkyl group
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Solution
Increasing the number of alkyl substituents on the double bond increases the stability of alkenes due to hyperconjugation.
Correct Answer:
A
— Increases stability
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Q. What is the hybridization of the carbon atoms in alkenes?
A.
sp
B.
sp2
C.
sp3
D.
None of the above
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Solution
The carbon atoms in alkenes are sp2 hybridized due to the presence of a double bond.
Correct Answer:
B
— sp2
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Q. What is the hybridization of the carbon atoms in ethylene (C2H4)?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
The carbon atoms in ethylene (C2H4) are sp2 hybridized due to the presence of a double bond.
Correct Answer:
B
— sp2
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Q. What is the hybridization of the carbon atoms involved in the double bond of alkenes?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
The carbon atoms in the double bond of alkenes are sp2 hybridized.
Correct Answer:
B
— sp2
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Q. What is the IUPAC name of CH2=CH-CH2-CH3?
A.
1-Butene
B.
2-Butene
C.
Propene
D.
Butyne
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Solution
The correct IUPAC name for CH2=CH-CH2-CH3 is 1-Butene, as the double bond is at the first carbon.
Correct Answer:
A
— 1-Butene
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Q. What is the IUPAC name of the alkene with the formula C5H10?
A.
Pentene
B.
Butene
C.
Hexene
D.
Cyclopentene
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Solution
The IUPAC name of the alkene with the formula C5H10 is pentene.
Correct Answer:
A
— Pentene
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Q. What is the IUPAC name of the compound CH2=CH-CH2-CH3?
A.
Butene
B.
Propene
C.
1-Butene
D.
2-Butene
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Solution
The compound CH2=CH-CH2-CH3 is named 1-Butene as the double bond is between the first and second carbon.
Correct Answer:
C
— 1-Butene
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Q. What is the main product of the reaction of ethene with ozone followed by zinc reduction?
A.
Acetaldehyde
B.
Ethylene glycol
C.
Acetic acid
D.
Ethane
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Solution
The ozonolysis of ethene followed by zinc reduction yields acetaldehyde.
Correct Answer:
A
— Acetaldehyde
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Q. What is the main product when 1-butene undergoes hydroboration-oxidation?
A.
Butanol
B.
Butanal
C.
Butyric acid
D.
Butene
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Solution
The main product of hydroboration-oxidation of 1-butene is butanol.
Correct Answer:
A
— Butanol
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Q. What is the main product when propene is reacted with hydrogen in the presence of a catalyst?
A.
Propane
B.
Butane
C.
Ethane
D.
Cyclopropane
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Solution
The main product of the hydrogenation of propene is propane.
Correct Answer:
A
— Propane
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Q. What is the main product when propene undergoes hydroboration-oxidation?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propanoic acid
D.
Butanol
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Solution
The main product of hydroboration-oxidation of propene is propan-2-ol.
Correct Answer:
B
— Propan-2-ol
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Q. What is the major product of the hydration of propene?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Butanol
D.
Ethylene glycol
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Solution
The major product of the hydration of propene is propan-2-ol due to Markovnikov's rule.
Correct Answer:
B
— Propan-2-ol
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Q. What is the major product of the reaction of 1-butene with HBr?
A.
1-bromobutane
B.
2-bromobutane
C.
Butane
D.
Bromobenzene
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Solution
The major product of the reaction of 1-butene with HBr is 2-bromobutane due to Markovnikov's rule.
Correct Answer:
B
— 2-bromobutane
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Q. What is the major product of the reaction of propene with HBr?
A.
1-Bromopropane
B.
2-Bromopropane
C.
Propyl bromide
D.
Bromopropene
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Solution
The major product of the reaction of propene with HBr is 2-bromopropane due to Markovnikov's rule.
Correct Answer:
B
— 2-Bromopropane
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Q. What is the major product when propene is treated with bromine?
A.
1-bromopropane
B.
2-bromopropane
C.
Bromopropane
D.
No reaction
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Solution
The major product of the reaction of propene with bromine is 2-bromopropane due to anti-addition.
Correct Answer:
B
— 2-bromopropane
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Q. What is the major product when propene reacts with HBr?
A.
1-Bromopropane
B.
2-Bromopropane
C.
Propyl bromide
D.
Bromopropene
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Solution
The major product of the reaction of propene with HBr is 2-Bromopropane due to Markovnikov's rule.
Correct Answer:
B
— 2-Bromopropane
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Q. What is the product of the hydration of ethene in the presence of sulfuric acid?
A.
Ethanol
B.
Ethane
C.
Acetic acid
D.
Butanol
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Solution
The hydration of ethene in the presence of sulfuric acid produces ethanol.
Correct Answer:
A
— Ethanol
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Q. What is the product of the ozonolysis of 1-pentene?
A.
Pentanal
B.
Acetaldehyde
C.
Butan-2-one
D.
Propanoic acid
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Solution
Ozonolysis of 1-pentene yields pentanal as one of the products.
Correct Answer:
A
— Pentanal
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Q. What is the product of the reaction of ethylene with chlorine?
A.
Ethyl chloride
B.
1,2-dichloroethane
C.
Chloroethane
D.
Ethylene dichloride
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Solution
The reaction of ethylene with chlorine results in the formation of 1,2-dichloroethane through an electrophilic addition mechanism.
Correct Answer:
B
— 1,2-dichloroethane
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Q. What type of hybridization is present in the carbon atoms of alkenes?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
The carbon atoms in alkenes are sp2 hybridized due to the presence of a double bond.
Correct Answer:
B
— sp2
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Q. What type of isomerism is exhibited by alkenes?
A.
Structural isomerism
B.
Geometric isomerism
C.
Optical isomerism
D.
All of the above
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Solution
Alkenes exhibit geometric isomerism due to restricted rotation around the double bond.
Correct Answer:
B
— Geometric isomerism
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Q. What type of isomerism is shown by 1-Butene and 2-Butene?
A.
Structural isomerism
B.
Geometric isomerism
C.
Optical isomerism
D.
None of the above
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Solution
1-Butene and 2-Butene are structural isomers as they differ in the position of the double bond.
Correct Answer:
A
— Structural isomerism
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Q. What type of isomerism is shown by alkenes?
A.
Geometric isomerism
B.
Structural isomerism
C.
Optical isomerism
D.
Tautomeric isomerism
Show solution
Solution
Alkenes exhibit geometric isomerism due to the restricted rotation around the double bond.
Correct Answer:
A
— Geometric isomerism
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Q. What type of isomerism is shown by butene?
A.
Structural isomerism
B.
Geometric isomerism
C.
Optical isomerism
D.
Tautomeric isomerism
Show solution
Solution
Butene exhibits geometric isomerism due to the restricted rotation around the double bond.
Correct Answer:
B
— Geometric isomerism
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Q. Which of the following alkenes has the highest boiling point?
A.
Ethene
B.
Propene
C.
Butene
D.
Pentene
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Solution
Pentene has the highest boiling point due to its larger molecular size and increased van der Waals forces.
Correct Answer:
D
— Pentene
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Q. Which of the following alkenes is most likely to undergo electrophilic addition reaction?
A.
Cyclohexene
B.
1,3-butadiene
C.
1-hexene
D.
2-methylpropene
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Solution
2-methylpropene is more reactive towards electrophilic addition due to steric hindrance being lower compared to other options.
Correct Answer:
D
— 2-methylpropene
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Q. Which of the following alkenes is most stable?
A.
1-Butene
B.
2-Butene
C.
Cyclohexene
D.
Propene
Show solution
Solution
2-Butene is more stable than 1-Butene due to hyperconjugation and steric hindrance.
Correct Answer:
B
— 2-Butene
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Q. Which of the following alkenes is the most stable?
A.
1-Butene
B.
2-Butene
C.
Cyclohexene
D.
Isobutylene
Show solution
Solution
2-Butene is more stable than 1-Butene due to hyperconjugation and steric factors.
Correct Answer:
B
— 2-Butene
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Q. Which of the following compounds can be formed by the elimination reaction of 2-bromobutane?
A.
1-Butene
B.
2-Butene
C.
Butyne
D.
All of the above
Show solution
Solution
2-bromobutane can undergo elimination to form both 1-butene and 2-butene.
Correct Answer:
B
— 2-Butene
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Q. Which of the following compounds can undergo polymerization to form polyethylene?
A.
Propylene
B.
Butylene
C.
Ethylene
D.
Isobutylene
Show solution
Solution
Ethylene can undergo addition polymerization to form polyethylene, a common plastic.
Correct Answer:
C
— Ethylene
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Showing 1 to 30 of 43 (2 Pages)
Alkenes MCQ & Objective Questions
Understanding alkenes is crucial for students preparing for school exams and competitive tests in India. These hydrocarbons play a significant role in organic chemistry, making them a frequent topic in MCQs and objective questions. By practicing alkenes MCQ questions, students can enhance their grasp of key concepts and improve their exam performance.
What You Will Practise Here
Definition and characteristics of alkenes
Structural formulas and isomerism in alkenes
Reactions of alkenes, including addition and polymerization
Mechanisms of electrophilic addition reactions
Important alkenes and their applications in real life
Key differences between alkenes and alkanes
Diagrams illustrating alkene structures and reaction pathways
Exam Relevance
Alkenes are a vital topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions related to the properties, reactions, and applications of alkenes. Common question patterns include identifying reaction mechanisms, predicting products of reactions, and solving problems related to the stability of alkenes. Mastering this topic can significantly boost your confidence and scores in these competitive exams.
Common Mistakes Students Make
Confusing alkenes with alkanes due to similar naming conventions
Misunderstanding the concept of cis-trans isomerism
Overlooking the importance of reaction conditions in electrophilic addition
Failing to recognize the significance of stability in reaction pathways
FAQs
Question: What are alkenes?Answer: Alkenes are unsaturated hydrocarbons containing at least one carbon-carbon double bond, which gives them unique chemical properties.
Question: How do I prepare for alkenes questions in exams?Answer: Focus on understanding the reactions, mechanisms, and applications of alkenes, and practice with objective questions to reinforce your knowledge.
Now is the time to enhance your understanding of alkenes! Dive into our practice MCQs and test your knowledge to ensure you are well-prepared for your exams. Every question solved brings you one step closer to success!
