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Which of the following compounds is the...

Which of the following compounds is the weakest Bronsted base?

A

B

C

D

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The correct Answer is:
C
Phenol is weakest Bronsted base as phenol after loosing H+ produce least stable conjugate acid among the compounds. Oxygen has more electronegative than N. so O- H bond is more polar and it has highest value of acidic character. Since, phenol is more acidic that alcohol, therefore phenol has the least tendency to accept a proton and hence it is weak Bronsted base. hence , phenol is least basic among given four choices.
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