The descending order of k_b values of the following compound is

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$a > c > d > b$

$d > b > c > a$

$a > c > b > d$

$b > d > c > a$

answer is B.

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Detailed Solution

Acidity is more, when the phenol has more number of minus I groups. Since the minus I nature will stabilise the carbanion intermediate. When we se the general order of acidity then

RCOOH > Phenol> water > alcohol > alkynes.

Ka is proportional to acidity and inversely to Pka. Kb is applicable to the phenolate ion. Since it is the conjugate base of phenol. More acidic the phenol less basic the phenolate and lower the kb value.

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