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What is the decreasing order of strength of the bases OH-, NH2-,H−C≡C- and CH3-CH2- ?

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Decreasing order of basic strength: NH2- >OH- > CH3-CH2- > H-C=C- 
OH- is a conjugate base of H2O and NH2- is a conjugate base of  NH3. H2O is stronger acid than NH3  so OH- is a weaker base than NH2- .
CH3-CH2-  is an alkane H-C=C-  alkyne in alkynes S character is more so acidic nature is more.

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Sorry but answer is A

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