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Arene diazonium salts are more stable th...

Arene diazonium salts are more stable than alkanediazonium salts due to dispersal of the positive charge on the benzene ring. Obviously, electron-donating groups favour diazotisation by retarding the decomposition of diazonium salts to phenyl cation. The high reactivity of arenediazonium salts is due to the excellent leaving ability of the diazo group as `N_2` gas.
Consider the following ions:

The reactivity of these ions towards azo coupling reactions under similar conditions is

A

`I lt IV lt II lt III`

B

`I lt III lt IV lt II`

C

`III lt I lt II lt IV`

D

`III lt I lt IV lt II`

Text Solution

Verified by Experts

The correct Answer is:
B
Less stable the diazonium salt more reactive it is. Since the stability decreases in the order : `I gt II gt IV gt II`, therefore, reactivity increases in the reverse order, i.e., `I lt III lt IV lt II. `
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