Assertion : $C H_{3} C O O^{-}$ (acetate ion) is more stable than $C_{2} H_{5} O^{-}$ (ethoxide ion). Reason: Electron delocalisation causes the negative charge in acetate to be shared equally by both oxygens. This type of resonance effect is not possible in ethoxide ion.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

$C H_{3} C O O^{-}$ (acetate ion) is more stable than $C_{2} H_{5} O^{-}$ (ethoxide ion). It is due to electron delocalizaton. Resonance structures, causes the negative charge in acetate to be shared equally by both oxygens. This resonance effect is not possible in ethoxide ion as the $+ I$ inductive effect of $C_{2} H_{5}$ makes it unstable.
Therefore, both assertion and reason are correct and reason is the correct explanation for assertion.

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