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CGP EDU Academic Team
Published on: August 14, 2026
Arrange the following in the correct order of their acidic strength
I II III IV
A
I 
II 
III 
IV
II III IV
B
IV 
I 
III 
II
I III II C
IV 
III 
II 
I
III II I
D
II 
III 
IV 
I
III IV I
Text Solution
Verified by ExpertsThe correct answer is:
B
Acidic strength 
s-character.
Due to maximum 
s-character of ethyne 
, hydrogen atoms attached to sp hybridised carbon of ethyne are most acidic followed by those attached to 
hybridised carbon of ethene ( 
) and those attached to 
hybridised carbon of ethane ( 
)
In case of propyne, acidic character decreases than that of ethyne due to 
effect.
Hence, order of acidic strength is:
IV I III IV
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