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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.
Which of the following arylamines undergoes diazotisation most readily?

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
C
The diazonium salt formed is stabilized by the powerful+R-effect of the `OCH_3` group.
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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