Which of the following has the lowest pK_a va | vedclass

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(D) The $pK_a$ value of a compound is inversely related to the stability of its conjugate base. $A$ more stable conjugate base corresponds to a strong

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(D) The $pK_a$ value of a compound is inversely related to the stability of its conjugate base. $A$ more stable conjugate base corresponds to a stronger acid and thus a lower $pK_a$ value. $1$. $pK_a$ of diphenylmethane is $\approx 32$. $2$. $pK_a$ of triphenylmethane is $\approx 31$. $3$. $pK_a$ of $9-$phenylfluorene is $18.5$. $4$. $pK_a$ of fluoradene is $11$. In fluoradene,the structure is rigid and planar,which allows for highly effective delocalization of the negative charge in the conjugate base across the entire aromatic system. This results in the highest stability of the conjugate base among the given options,making fluoradene the strongest acid with the lowest $pK_a$ value.

Which of the following has the lowest $pK_a$ value?

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