1. CHequiv CH > CH₃-Cequiv CH > CH₂=CH₂ > CH₃-CH₃ 2. CHequiv CH > CH₂=CH₂ > CH₃-Cequiv CH > CH₃-CH₃ 3. CH₃-CH₃ > CH₂=CH₂ > CH₃-Cequiv CH > CHequiv CH 4. CH₂=CH₂ > CH₃-CH=CH₂ > CH₃-Cequiv CH > CHequiv CH

Which one is the correct order of acidity ?

1. \(CH\equiv CH > CH_3-C\equiv CH > CH_2=CH_2 > CH_3-CH_3\)

2. \(CH\equiv CH > CH_2=CH_2 > CH_3-C\equiv CH > CH_3-CH_3\)

3. \(CH_3-CH_3 > CH_2=CH_2 > CH_3-C\equiv CH > CH\equiv CH\)

4. \(CH_2=CH_2 > CH_3-CH=CH_2 > CH_3-C\equiv CH > CH\equiv CH\)

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

Best answer

Answer: 1. \(CH\equiv CH > CH_3-C\equiv CH > CH_2=CH_2 > CH_3-CH_3\)

Key idea: acidity of a C-H bond increases with the s-character of carbon.

Ethyne (sp, 50% s) > propyne (sp; methyl is electron-donating, so slightly less acidic) > ethene (\(sp^2\), 33% s) > ethane (\(sp^3\), 25% s).

Order: \(HC\equiv CH > CH_3C\equiv CH > CH_2=CH_2 > CH_3CH_3\).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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