The relative order of basicity of conjugate bases is

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$HC \equiv C^{-} < {OH}^{-} < {OR}^{-}$

${OH}^{-} < {OR}^{-} < HC \equiv C^{-}$

$OH < {HC}^{\equiv} \equiv C^{-} < {OR}^{-}$

$HC \equiv C^{-} < {OR}^{-} < {OH}^{-}$

answer is A.

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Detailed Solution

The relative order of basicity of conjugate bases is ${OH}^{-} < {OR}^{-} < HC \equiv C^{-}$

Equivalent Base. An acid loses a hydrogen ion, creating a conjugate base. Being able to absorb a hydrogen ion to rebuild the acid qualifies it as a basic.

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