Which Aniline Derivative Is More Basic: Ortho or Para Substituted?

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SUMMARY

The discussion focuses on the basicity of aniline derivatives, specifically comparing ortho and para substituted isomers. It concludes that para-substituted anilines, such as p-methyl aniline and p-chloro aniline, are generally more basic than their ortho counterparts due to less steric hindrance and better resonance stabilization of the positive charge on nitrogen after protonation. The analysis also includes comparisons between o-chloro aniline and o-floro aniline, as well as o-nitro aniline and p-nitro aniline, emphasizing the influence of substituents on basicity.

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Homework Statement



Which isomer is more basic in the following pairs:

o-methyl aniline or p-methyl aniline

o-chloro aniline or p - chloro aniline

o - chloro aniline or o-floro aniline

o-nitro aniline or p-nitro aniline
 
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I'd think about this in terms of factors that either stabilize or destabilize the positive charge on nitrogen after it accepts a proton. For example if the charge is destabilized more it means the conjugate base must be weaker.
 

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