Write the correct order of rate of reaction of following with PhN$_2$Cl
Write the correct order of rate of reaction of following with PhN$_2$Cl
Show Hint
- R>P>Q
- P>R>Q
- Q>P>R
- P>Q>R
The Correct Option is A
Solution and Explanation
The rate of reaction with PhN$_2$Cl (azo coupling) is affected by substituents on the aromatic ring. Electron-donating groups (EDGs) increase the electron density of the ring, making it more nucleophilic and increasing the rate.
1. R has an NH$_2$ group, which is a strong EDG (+M effect).
2. P has a CH$_3$ group, which is a weak EDG (+I and hyperconjugation).
3. Q has an NO$_2$ group, which is a strong electron-withdrawing group (-M effect).
Thus, the correct order of reaction rate is R>P>Q.
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