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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Solution
Ethylene can undergo addition polymerization to form polyethylene, a common plastic.
Correct Answer: C — Ethylene
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