To evaluate the assertion that benzylamine is more basic than aniline and the reason that the NH2 group is an electron-releasing group, we need to consider the structure and properties of both compounds. Let's break this down step by step.
Understanding Basicity
Basicity in organic chemistry refers to the ability of a compound to accept protons (H+ ions). The more readily a compound can accept a proton, the more basic it is. Basicity is influenced by the presence of electron-donating or electron-withdrawing groups attached to the nitrogen atom.
Analyzing Benzylamine and Aniline
- Benzylamine: This compound has a benzyl group (C6H5CH2-) attached to the amine (NH2) group. The benzyl group can stabilize the positive charge that forms when the nitrogen atom accepts a proton, thus enhancing the basicity of benzylamine.
- Aniline: In aniline, the amino group is directly attached to a phenyl ring (C6H5-). The phenyl ring is an electron-withdrawing group due to resonance effects, which can delocalize the lone pair of electrons on the nitrogen. This delocalization makes it less available to bond with protons, thus reducing the basicity of aniline.
Comparing Basicity
When we compare the two, benzylamine is indeed more basic than aniline. The reason for this is that the benzyl group does not significantly withdraw electron density from the nitrogen atom, allowing it to retain its ability to accept protons more effectively than the nitrogen in aniline, where the resonance with the phenyl ring decreases the availability of the lone pair.
Evaluating the Assertion and Reason
Now, let's assess the assertion and the reason:
- The assertion that benzylamine is more basic than aniline is true.
- The reason given is that the NH2 group is an electron-releasing group, which is also true. However, it does not fully explain why benzylamine is more basic than aniline, as the electron-releasing effect of the NH2 group is overshadowed by the resonance effect of the phenyl ring in aniline.
Conclusion on the Options
Based on this analysis, the correct choice is:
A. Assertion and Reason are true and Reason is not the correct explanation of Assertion.
This option accurately reflects that while both statements are true, the reason does not adequately explain the assertion regarding the basicity of benzylamine compared to aniline.
