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 in the nitration of benzene?
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A.
H2SO4
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B.
HNO3
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C.
HCl
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D.
NaOH
Solution
In the nitration of benzene, a mixture of concentrated nitric acid (HNO3) and sulfuric acid (H2SO4) is used to introduce a nitro group.
Correct Answer: B — HNO3
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Q. Which reagent is commonly used to convert alkynes to alkenes?
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A.
H2/Pd
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B.
LiAlH4
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C.
Br2
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D.
KMnO4
Solution
Hydrogenation using H2 in the presence of a catalyst like Pd converts alkynes to alkenes.
Correct Answer: A — H2/Pd
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Q. Which reagent is commonly used to convert an alkyne to a cis-alkene?
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A.
H2/Pd
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B.
H2/Lindlar's catalyst
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C.
LiAlH4
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D.
NaNH2
Solution
H2 in the presence of Lindlar's catalyst is used to convert alkynes to cis-alkenes.
Correct Answer: B — H2/Lindlar's catalyst
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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 commonly used to test for the presence of alkynes?
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A.
Bromine water
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B.
Silver nitrate
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C.
Sodium metal
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D.
Bayer's reagent
Solution
Bromine water is used to test for the presence of alkynes, which will decolorize the solution.
Correct Answer: A — Bromine water
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Q. Which reagent is commonly used to test for the presence of aromatic compounds?
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A.
Bromine water
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B.
Silver nitrate
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C.
Bayer's reagent
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D.
Sodium dichromate
Solution
Bromine water is used to test for unsaturation; aromatic compounds do not react with it, indicating their stability.
Correct Answer: A — Bromine water
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Q. Which reagent is used for the selective hydrogenation of alkynes to alkenes?
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A.
Pd/BaSO4
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B.
LiAlH4
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C.
H2/Pt
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D.
NaNH2
Solution
Pd/BaSO4 is used as a catalyst for the selective hydrogenation of alkynes to form alkenes.
Correct Answer: A — Pd/BaSO4
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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 convert an alkyne to a cis-alkene?
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A.
H2/Pd
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B.
H2/Lindlar's catalyst
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C.
Li/NH3
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D.
Na/NH3
Solution
H2 in the presence of Lindlar's catalyst is used to convert an alkyne to a cis-alkene.
Correct Answer: B — H2/Lindlar's catalyst
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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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