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13.3     Account for the following:

                 (i) pKb of aniline is more than that of methylamine..

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Here is the structure of aniline and methylamine

                                                                                                                                                                                   

  Due to the resonance in aniline the electrons of nitrogen atoms delocalised over benzene ring. So, because of that, the electron density at N atom decreases and less available for donation.

           

                                                                                                            On the other hand, In the case of methylamine, the methyl (CH_{3}) group is electron donating group (+I effect) which increase the electron density at N atom. Hence pK_{b} value of aniline is higher than that of methylamine.

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