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Coupling of diazonium salts of following...

Coupling of diazonium salts of following takes place in the order

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D
Electron withdrawing groups `(likeoverset(+)NH_(3))` accelerate coupling while electron releasing grops (like `NH_(2),OH` and `Obar`) retard coupling Since electron releasing power is `-barO gt NH_(2) gt OH` the order of reactivity is
(IV)gt(II)gt(III)gt(I) .
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