For the diazonium ions the order of reactivity towards diazo-coupling with phenol in the presence of dilute $NaOH $ is
A$I < IV < II < III$
B$I < III < IV < II$
C$III < I < II < IV$
D$III < I < IV < II$
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B$I < III < IV < II$
b $(b)$ More electron withdrawing group, more will be electrophilic nature.
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