7. Substitution Reactions
Substitution Comparison
34PRACTICE PROBLEM
For this problem, review the Hammett equation. Consider the reaction shown below. When R = Ph, the ρ-value for the reaction is –5.4, while when R = H, the ρ-value for the reaction is –0.5. What accounts for the difference in the ρ-values?
![](https://lightcat-files.s3.amazonaws.com/problem_images/550ca3b6429240b7-1681488864827.jpg)
For this problem, review the Hammett equation. Consider the reaction shown below. When R = Ph, the ρ-value for the reaction is –5.4, while when R = H, the ρ-value for the reaction is –0.5. What accounts for the difference in the ρ-values?