Give reasons for the following
(a) Acetylation of aniline reduces its activation effect.
(b) `CH_(3)NH_(2)` is more basiic than `C_(6)H_(5)NH_(2)`.
(c) Although `-NH_(2)` is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.

Explanation

Let's break down the solution to the question step by step.

### (a) Acetylation of aniline reduces its activation effect.

1. **Understanding Aniline's Structure**: Aniline has an amino group (-NH2) attached to a benzene ring. The lone pair of electrons on the nitrogen atom can delocalize into the aromatic ring, increasing the electron density at the ortho and para positions.

2. **Effect of Acetylation**: When aniline undergoes acetylation, it forms acetanilide. In this process, the nitrogen's lone pair is partially involved in resonance with the carbonyl group (C=O) of the acetyl group.

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