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Acidic Hydrogen is Present in

Acidic hydrogen is present in: A. Ethyne B. Ethene C. Benzene D. Ethane. Find the answer to this question and access a vast question bank that is customised for students.

Q. Acidic Hydrogen is Present in: 

A. Ethyne

B. Ethene 

C. Benzene 

D. Ethane  

Answer: A. Ethyne

Explanation: Acidic hydrogen means cation of Hydrogen or H+. The acidic hydrogen is directly proportional to the s-character of hybridisation.

Ethyne is an alkyne with sp hybridisation,

Ethane is an alkane with sp³ hybridisation,

Ethene is an alkene with sp² hybridisation,

And Benzene is a cyclic alkene with sp² hybridisation.

If we look at the hybridisation of Ethyne, Ethene, Benzene, and Ethane, 

We will get the following s character percentage.

Compound

Chemical formula

Hybridization

s character (%)

Ethyne

CH ≡ CH

sp

50

Ethene

CH2=CH2

sp²

33.33

Benzene

C6H6

sp²

33.33

Ethane

CH3−CH3

sp³

25

As the highest s-character percentage can be seen in Ethyne, its electronegativity would be highest as the carbon is close to the nucleus. This results in the release of Hydrogen ions, and hence, its hydrogen atom will be most acidic.