First slide

Acidic Strength

Question

$Correct order of P^{ka} is$

Moderate

A

$A < D < B < C$
B

$D < A < C < B$
C

$A < C < B \approx D$
D

$D < C < A < B$

Solution

$- {CH}_{3} group at o, p positions show + I, + R (Hyper conjugation)$
$∴ o, p - cresols are least acidic .$
$- {CH}_{3} group at meta position show only + I effect$
$∴ meta cresol is more acidic than o & p cresols$
$∵ - {CH}_{3} group is an EDG, cresols are less acidic than phenol$
$Experiments showed that P^{ka} of o - cresol = p - cresol$
$∴ P^{ka} of A (10) < C (10.1) < B = D (10.2)$

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