Q.

Consider the following diazonium ions: 
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The order of reactivity towards diazo-coupling with phenol in the presence of dil. NaOH is

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a

I<IV<II<III

b

I<III<IV<II

c

III<I<IV<II

d

III<I<II<IV

answer is B.

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Detailed Solution

Diazonium ion acts as an electrophile in coupling reaction. The greater the electron-withdrawing power. The Higher is the elcctrophilicity.

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Consider the following diazonium ions: The order of reactivity towards diazo-coupling with phenol in the presence of dil. NaOH is