Consider the following diazonium ions :

The order of reactivity towards diazo-coupling with phenol in the presence of dil. NaOH is -

I < IV < II < III

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I < III < IV < II

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III < I < II < IV

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III < I < IV < II

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Solution

The correct option is B
I < III < IV < II

Diazonium ion acts as electrophile in coupling reaction; greater the electron withdrawing power, higher the electrophilicity.

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50^{\circ}

Predict the order of reactivity of the following compounds in dehydrohalogenation.

Arrange the following in increasing acidic character
Phenol, m - nitrophenol, m - chlorophenol, m - cresol
I II III IV

S N_{2}

C H_{3} C H_{2} C H_{2} C l . . . . . . . . . (i)

C H_{3} C H_{2} C H C l C H_{3} . . . . . . . (i i)

(C H_{3})_{2} C H C H_{2} C l . . . . . . . . (i i i)

(C H_{3})_{3} C - C l . . . . . . . . . . (i v)

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