Question:
Order of acidity CH=CH, CH₃-C=CH, CH₃-C=C-CH₃?
Order of acidity CH=CH, CH₃-C=CH, CH₃-C=C-CH₃?
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The more electron-donating groups attached to a double bond, the less acidic the compound. For alkenes, consider the effect of substituents on electron density when predicting acidity.
Updated On: Apr 7, 2026
- CH=CH > CH₃-C=CH > CH₃-C=C-CH₃
- CH₃-C=CH > CH=CH > CH₃-C=C-CH₃
- CH₃-C=C-CH₃ > CH₃-C=CH > CH=CH
- CH₃-C=CH > CH₃-C=C-CH₃ > CH=CH
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The Correct Option is A
Solution and Explanation
Acidity in alkenes is influenced by the electron-donating or electron-withdrawing effects of substituents attached to the double-bonded carbons. - CH=CH (ethene) has no substituents, making it the most acidic because there are no electron-donating groups to stabilize the conjugate base. - CH₃-C=CH (propene) has a methyl group attached to one of the carbons, which donates electron density and reduces acidity slightly compared to ethene. - CH₃-C=C-CH₃ (butene) has two methyl groups, further donating electron density, which makes it the least acidic. Thus, the order of acidity is CH=CH > CH₃-C=CH > CH₃-C=C-CH₃.
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