Alkynes(Acidic Character: Addition of Hydrogen,...) NEET Questions

Organic Chemistry - Hydrocarbons

Alkynes(Acidic Character: Addition of Hydrogen,...) MCQ Questions


1.
Which of the following hydrocarbons exhibits the highest acidic character?
A.
CH4 (Methane)
B.
HC≡CH (Ethyne)
C.
CH2=CH2 (Ethene)
D.
CH3-CH3 (Ethane)
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ANSWER :
B. HC≡CH (Ethyne)
2.
The acidic nature of the terminal hydrogen in alkynes is due to:
A.
sp³ hybridization with 25% s-character
B.
Presence of two pi bonds
C.
sp² hybridization with 33% s-character
D.
sp hybridization of carbon with 50% s-character
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ANSWER :
D. sp hybridization of carbon with 50% s-character
3.
Which of the following alkynes will react with sodium metal to liberate H2 gas?
A.
CH3-C≡CH
B.
CH3-C≡C-C2H5
C.
C2H5-C≡C-C2H5
D.
CH3-C≡C-CH3
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ANSWER :
A. CH3-C≡CH
4.
When ethyne reacts with sodamide (NaNH2), the product formed is:
A.
Ethene and sodium amide
B.
Disodium acetylide and NH3
C.
Sodium acetylide (HC≡C⁻Na⁺) and NH3
D.
Sodium ethanide and H2O
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ANSWER :
C. Sodium acetylide (HC≡C⁻Na⁺) and NH3
5.
Which of the following will NOT react with ammoniacal silver nitrate (Tollen's reagent) to give a precipitate?
A.
But-2-yne
B.
But-1-yne
C.
Ethyne
D.
Propyne
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ANSWER :
A. But-2-yne
6.
The correct order of acidic strength is:
A.
CH2=CH2 > HC≡CH > CH3-CH3
B.
HC≡CH > CH3-CH3 > CH2=CH2
C.
HC≡CH > CH2=CH2 > CH3-CH3
D.
CH3-CH3 > CH2=CH2 > HC≡CH
😑 View Answer Rough Work Error
ANSWER :
C. HC≡CH > CH2=CH2 > CH3-CH3