Q. Which of the following compounds is an alkene?
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A.
C2H6
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B.
C3H8
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C.
C4H8
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D.
C5H12
Solution
C4H8 is an alkene as it contains a carbon-carbon double bond.
Correct Answer: C — C4H8
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Q. Which of the following compounds is an example of a cyclic alkene?
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A.
Cyclopropene
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B.
Butene
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C.
Hexene
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D.
Octene
Solution
Cyclopropene is an example of a cyclic alkene.
Correct Answer: A — Cyclopropene
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Q. Which of the following is the general formula for alkenes?
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A.
C_nH_(2n)
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B.
C_nH_(2n+2)
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C.
C_nH_(2n-2)
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D.
C_nH_n
Solution
The general formula for alkenes is C_nH_(2n), where n is the number of carbon atoms.
Correct Answer: A — C_nH_(2n)
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Q. Which of the following reactions can be used to convert an alkene into an alcohol?
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A.
Hydrogenation
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B.
Hydroboration-oxidation
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C.
Dehydrohalogenation
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D.
Electrophilic addition
Solution
Hydroboration-oxidation is a two-step process that converts alkenes into alcohols.
Correct Answer: B — Hydroboration-oxidation
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Q. Which of the following reactions is characteristic of alkenes?
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A.
Electrophilic addition
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B.
Nucleophilic substitution
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C.
Free radical substitution
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D.
Elimination
Solution
Alkenes undergo electrophilic addition reactions due to the presence of a double bond.
Correct Answer: A — Electrophilic addition
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Q. Which of the following reactions is not typical for alkenes?
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A.
Addition of H2
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B.
Addition of HCl
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C.
Elimination of H2O
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D.
Substitution reaction
Solution
Alkenes typically undergo addition reactions rather than substitution reactions.
Correct Answer: D — Substitution reaction
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Q. Which of the following statements about alkenes is true?
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A.
They are saturated hydrocarbons.
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B.
They can undergo polymerization.
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C.
They do not react with electrophiles.
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D.
They have a higher boiling point than alkanes.
Solution
Alkenes can undergo polymerization due to the presence of a double bond.
Correct Answer: B — They can undergo polymerization.
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Q. Which reagent can be used to test for the presence of alkenes?
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A.
Bromine water
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B.
Silver nitrate
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C.
Sodium hydroxide
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D.
Hydrochloric acid
Solution
Bromine water is used to test for alkenes; it will decolorize in the presence of a double bond.
Correct Answer: A — Bromine water
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Q. Which reagent is commonly used for the hydrogenation of alkenes?
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A.
H2/Pt
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B.
H2O
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C.
Br2
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D.
NaOH
Solution
H2 in the presence of a catalyst like platinum (Pt) is commonly used for the hydrogenation of alkenes.
Correct Answer: A — H2/Pt
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Q. Which reagent is commonly used for the ozonolysis of alkenes?
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A.
KMnO4
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B.
O3
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C.
H2O2
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D.
NaBH4
Solution
Ozonolysis of alkenes is performed using ozone (O3) to cleave the double bond and form carbonyl compounds.
Correct Answer: B — O3
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Q. Which reagent is commonly used to test for the presence of alkenes?
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A.
Bromine water
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B.
Silver nitrate
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C.
Sodium hydroxide
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D.
Hydrochloric acid
Solution
Bromine water is used to test for alkenes, as it will decolorize in their presence.
Correct Answer: A — Bromine water
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Q. Which reagent is used for the test of unsaturation in alkenes?
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A.
Bromine water
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B.
Potassium permanganate
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C.
Sodium dichromate
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D.
All of the above
Solution
Bromine water is commonly used to test for unsaturation; it decolorizes in the presence of alkenes.
Correct Answer: A — Bromine water
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Q. Which reagent is used to test for the presence of alkenes?
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A.
Bromine water
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B.
Potassium permanganate
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C.
Both A and B
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D.
None of the above
Solution
Both bromine water and potassium permanganate can be used to test for alkenes, as they react with the double bond.
Correct Answer: C — Both A and B
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