Q. What is the bond angle around the carbon atoms in an alkyne?
-
A.
120 degrees
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B.
180 degrees
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C.
109.5 degrees
-
D.
90 degrees
Solution
The bond angle around the carbon atoms in an alkyne is approximately 180 degrees due to linear geometry.
Correct Answer: B — 180 degrees
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Q. What is the general formula for alkynes?
-
A.
C_nH_(2n+2)
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B.
C_nH_(2n)
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C.
C_nH_(2n-2)
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D.
C_nH_(2n-1)
Solution
The general formula for alkynes is C_nH_(2n-2), where n is the number of carbon atoms.
Correct Answer: C — C_nH_(2n-2)
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Q. What is the hybridization of the carbon atoms in an alkyne?
-
A.
sp
-
B.
sp2
-
C.
sp3
-
D.
dsp3
Solution
In alkynes, the carbon atoms involved in the triple bond are sp hybridized.
Correct Answer: A — sp
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Q. What is the hybridization of the carbon atoms in ethyne (C2H2)?
-
A.
sp
-
B.
sp2
-
C.
sp3
-
D.
dsp3
Solution
In ethyne, the carbon atoms are sp hybridized due to the presence of a triple bond.
Correct Answer: A — sp
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Q. What is the IUPAC name of the compound CH≡C-CH2-CH3?
-
A.
1-butyne
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B.
2-butyne
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C.
1-pentyne
-
D.
3-pentyne
Solution
The IUPAC name of CH≡C-CH2-CH3 is 1-butyne.
Correct Answer: A — 1-butyne
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Q. What is the IUPAC name of the compound with the formula C4H6?
-
A.
1-butyne
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B.
2-butyne
-
C.
Cyclobutene
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D.
Butadiene
Solution
The compound C4H6 is named 2-butyne according to IUPAC nomenclature.
Correct Answer: B — 2-butyne
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Q. What is the main feature of terminal alkynes?
-
A.
They have a triple bond in the middle
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B.
They can form carbanions
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C.
They are less acidic than alkenes
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D.
They cannot undergo substitution reactions
Solution
Terminal alkynes can form carbanions due to the acidity of the hydrogen atom attached to the sp-hybridized carbon.
Correct Answer: B — They can form carbanions
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Q. What is the main feature that distinguishes alkynes from alkenes?
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A.
Presence of double bonds
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B.
Presence of triple bonds
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C.
Saturation
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D.
Molecular weight
Solution
Alkynes are distinguished from alkenes by the presence of triple bonds.
Correct Answer: B — Presence of triple bonds
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Q. What is the main product when 1-butyne is treated with HBr?
-
A.
1-bromobutane
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B.
2-bromobutane
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C.
1,2-dibromobutane
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D.
No reaction
Solution
When 1-butyne reacts with HBr, the main product is 2-bromobutane due to Markovnikov's rule.
Correct Answer: B — 2-bromobutane
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Q. What is the main product when 2-butyne is treated with excess H2 in the presence of a catalyst?
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A.
1-butyne
-
B.
Butane
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C.
2-butyne
-
D.
Ethyne
Solution
The main product is butane, as 2-butyne is fully hydrogenated to form butane.
Correct Answer: B — Butane
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Q. What is the main product when 2-butyne undergoes hydroboration-oxidation?
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A.
Butanol
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B.
Butanal
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C.
Butyric acid
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D.
Butene
Solution
The main product is Butanol when 2-butyne undergoes hydroboration-oxidation.
Correct Answer: A — Butanol
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Q. What is the major product of the reaction of 2-butyne with H2 in the presence of a catalyst?
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A.
1-butyne
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B.
butane
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C.
2-butyne
-
D.
3-butyne
Solution
The major product of hydrogenation of 2-butyne is butane.
Correct Answer: B — butane
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Q. What is the product of the complete combustion of an alkyne?
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A.
CO2 and H2O
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B.
CO and H2O
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C.
C and H2O
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D.
C2H4
Solution
The complete combustion of an alkyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
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Q. What is the product of the complete hydrogenation of 2-butyne?
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A.
1-butyne
-
B.
2-butyne
-
C.
butane
-
D.
butyne
Solution
The complete hydrogenation of 2-butyne results in butane.
Correct Answer: C — butane
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Q. What is the product of the reaction between 1-butyne and HBr?
-
A.
1-bromobutane
-
B.
2-bromobutane
-
C.
butane
-
D.
butyne
Solution
The reaction of 1-butyne with HBr leads to the formation of 2-bromobutane due to Markovnikov's rule.
Correct Answer: B — 2-bromobutane
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Q. What is the product of the reaction of 1-butyne with HBr?
-
A.
1-bromobutane
-
B.
2-bromobutane
-
C.
Butane
-
D.
Butyne
Solution
The reaction of 1-butyne with HBr leads to the formation of 2-bromobutane due to Markovnikov's rule.
Correct Answer: B — 2-bromobutane
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Q. What type of hybridization is present in alkynes?
Solution
Alkynes have sp hybridization due to the presence of a triple bond.
Correct Answer: A — sp
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Q. What type of hybridization occurs in the carbon atoms of alkynes?
Solution
In alkynes, the carbon atoms are sp hybridized.
Correct Answer: A — sp
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Q. What type of isomerism is shown by 1-butyne and 2-butyne?
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A.
Structural isomerism
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B.
Geometric isomerism
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C.
Optical isomerism
-
D.
Conformational isomerism
Solution
1-butyne and 2-butyne are structural isomers as they differ in the position of the triple bond.
Correct Answer: A — Structural isomerism
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Q. Which of the following alkynes is symmetrical?
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A.
1-butyne
-
B.
2-butyne
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C.
1-pentyne
-
D.
3-pentyne
Solution
2-butyne is a symmetrical alkyne.
Correct Answer: B — 2-butyne
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Q. Which of the following alkynes is the most acidic?
-
A.
Ethylene
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B.
Propyne
-
C.
Butyne
-
D.
Acetylene
Solution
Acetylene (ethyne) is the most acidic among the given alkynes due to the sp hybridization of carbon.
Correct Answer: D — Acetylene
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Q. Which of the following alkynes is the most stable?
-
A.
1-butyne
-
B.
2-butyne
-
C.
1-pentyne
-
D.
3-pentyne
Solution
2-butyne is more stable than 1-butyne due to steric hindrance and hyperconjugation.
Correct Answer: B — 2-butyne
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Q. Which of the following alkynes is the simplest?
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A.
1-butyne
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B.
2-butyne
-
C.
Ethyne
-
D.
Propyne
Solution
Ethyne (C2H2) is the simplest alkyne.
Correct Answer: C — Ethyne
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Q. Which of the following compounds is an alkyne?
-
A.
C2H4
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B.
C3H6
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C.
C4H8
-
D.
C5H8
Solution
C5H8 is an alkyne, as it follows the general formula C_nH_(2n-2).
Correct Answer: D — C5H8
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Q. Which of the following compounds is an aromatic alkyne?
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A.
Phenylacetylene
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B.
Propyne
-
C.
Ethyne
-
D.
1-butyne
Solution
Phenylacetylene is an aromatic alkyne as it contains a phenyl group attached to a triple bond.
Correct Answer: A — Phenylacetylene
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Q. Which of the following compounds is the most acidic?
-
A.
Ethylene
-
B.
Propene
-
C.
Propyne
-
D.
Butyne
Solution
Propyne is the most acidic due to the sp hybridization of the carbon atom involved in the triple bond.
Correct Answer: C — Propyne
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Q. Which of the following is a characteristic property of alkynes?
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A.
Higher boiling points than alkenes
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B.
Lower reactivity than alkenes
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C.
Inability to undergo addition reactions
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D.
Higher density than alkanes
Solution
Alkynes generally have higher boiling points than alkenes due to stronger intermolecular forces.
Correct Answer: A — Higher boiling points than alkenes
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Q. Which of the following is a terminal alkyne?
-
A.
1-butyne
-
B.
2-butyne
-
C.
1-pentyne
-
D.
3-pentyne
Solution
1-butyne is a terminal alkyne because it has a triple bond at the end of the carbon chain.
Correct Answer: A — 1-butyne
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Q. Which of the following is the correct reaction for the hydrogenation of 1-butyne?
-
A.
C4H6 + H2 → C4H10
-
B.
C4H6 + H2 → C4H8
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C.
C4H6 + H2 → C4H12
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D.
C4H6 + H2 → C4H4
Solution
1-butyne (C4H6) reacts with hydrogen (H2) to form butene (C4H8) under catalytic conditions.
Correct Answer: B — C4H6 + H2 → C4H8
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Q. Which of the following is the correct structure for 2-butyne?
-
A.
CH3-C≡C-CH3
-
B.
CH3-CH≡C-CH3
-
C.
CH3-C=C-CH3
-
D.
C≡C-CH2-CH3
Solution
2-butyne has the structure CH3-CH≡C-CH3, with the triple bond between the second and third carbon.
Correct Answer: B — CH3-CH≡C-CH3
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