Assertion :Tert-Butoxide is a stronger base than $O H^{-}$ or $C_{2} H_{5} O^{-}$ ion but is a much poorer nucleophile.
$B e c a u s e$ Reason: A negatively charged ions is always more powerful nucleophile than its conjugate acid.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Tert-Butoxide $(C H_{3})_{3} C O^{-}$ is a stronger base than $O H^{-}$ or $C_{2} H_{5} O^{-}$ ion due to presence of $+ I$ inductive effect or electron releasing methyl groups. But it is a much poorer nucleophile as t-butoxide a bulky base and steric hindrance do not allow the reaction with ease.

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