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Question
pKa value is greater for
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Solution
The correct option is C
Conjugate base of phenol is stabilised by conjugation of negative charge in the ring. Acidic strength is inversely propotional to EDGs and directly propotional to EWGs.
pKa is inversly proportonal to the ability to release protons or acidity.
Options b and d having EWG makes them more acidic and so with less pKa.
Options a and c are phenols with option c having deutrium (heavier isotope of H). Deuterium is more electron donating as compared to H making phenol less acidic and have the highest pKa value
Hence, pKa is higher for (c).
Conjugate base of phenol is stabilised by conjugation of negative charge in the ring. Acidic strength is inversely propotional to EDGs and directly propotional to EWGs.
pKa is inversly proportonal to the ability to release protons or acidity.
Options b and d having EWG makes them more acidic and so with less pKa.
Options a and c are phenols with option c having deutrium (heavier isotope of H). Deuterium is more electron donating as compared to H making phenol less acidic and have the highest pKa value
Hence, pKa is higher for (c).
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