The strongest conjugate base results from_____

formic acid

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benzoic acid

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acetic acid

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acetylene

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Solution

The correct option is D acetylene
The strongest conjugate base results from acetylene since it is the weakest acid among formic acid, benzoic acid, acetic acid, and acetylene.

The order of strength of acids is given below:

$A c e t y l e n e < A c e t i c A c i d < F o r m i c A c i d < B e n z o i c A c i d$
Weaker an acid, stronger will be its conjugate base.

Hence, the order of strength of conjugate bases will be as follows:

$A c e t y l e n e > A c e t i c A c i d > F o r m i c A c i d > B e n z o i c A c i d$

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