Question

The decreasing order of acidity of ethane, ethylene and acetylene is ?​

Answer 1

Answer:

Both the hydrogen atoms are identical and connected with carbon which is sp hybridised hence, Ethyne is most acidic. The correct order is: Ethyne> Ethene >Ethane

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Answer 2

The decreasing order of acidity of ethane, ethylene and acetylene is- acetylene>ethylene>ethane

• Acetylene has sp hybridised C atoms. So, the % of a character is 50% and it has the highest electronegativity. So, it can easily release hydrogen ions and act as a strong acid.
• Ethylene has $sp^2$ hybridised C atoms. So, the % of a character is 33% and it has moderate electronegativity. So, it can release hydrogen ions and act as a moderately strong acid.
• Ethane has $sp^3$ hybridised C atoms. So, the % of a character is 25% and it has the lowest electronegativity. So, it can't release hydrogen ions easily and act as the weakest acid.
• The order of acidity is acetylene>ethylene>ethane.