Arrange for increasing acidic strength: H₂O, NH₃, C₂H₂ and C₂H₆
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Answer : The order of acidic nature would be: water > ethyne > ammonia > ethane.
Since oxygen has highest electronegativity amongst the atoms of the compounds, so its hydrogen will be most acidic and hence will be best acid among them.
Ethyne contains sp-carbon and as a result the electronegativity of the carbon in ethyne is more than sp3 due to increased s-character (50%) in the bonds between the carbon atoms.
The electronegativity of the carbon increases to a great extent when and turns out to be 3.2, which is greater than the electronegativity of nitrogen which is 3.04. Hence the hydrogen of ethyne is more acidic than that of NH3.
Ethane does not possess any acidic hydrogen hence it is least acidic.
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