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  • Among the following marked proton of which compound shows lowest value ?Option: 1</st

Among the following marked proton of which compound shows lowest \mathrm{pK_{a}} value ?

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

best_answer

\mathrm{pK_{a}} value is determined by the acidic character of a molecule and acidic character is determined by stability of conjugate base.

Lowest \mathrm{pK_{a}} value will be shown by highest acidic compound means most stable conjugate base.

Conjugate base of 



Which is most stable because of Resonance through benzene ring.

Hence option (C) is correct.

Posted by

Divya Prakash Singh

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