Arrange the following compounds in their increasing $p K_{b}$ order:

c < d < a < b

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b < a < d < c

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d < b < a < c

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a < b < d < c

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Solution

The correct option is B $b < a < d < c$
Basicity order $α + I, + M$ and hyperconjugation. Therefore $p K_{b}$ order is $b < a < d < c$

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