Question

The increasing order of reactivity of these diazonium ions in azo-coupling reaction (under similar conditions) will be:

• A. I < IV < II < III
• B. I < III < IV < II
• C. III < II < IV < I
• D. III < I < IV < II

Answer 1

Answer: (B)

I < III < IV < II

Strong the electron withdrawing group, more will be the electrophilic nature.

Increasing order of electron withdrawing group is given by :

-$N{O}_2>-C{H}_3>-OC{H}_3>-(C{H}_3{)}_{2}N$

Therefore, correct order of reactivity is 1 < 3 < 4 < 2.

Hence, the correct option is B.