Arrange in the decreasing order of basic nature,
i. Pyrrole ii. Pyridine ii. Aniline

Explanation

To determine the decreasing order of basic nature among pyrrole, pyridine, and aniline, we need to analyze the availability of the lone pair of electrons on the nitrogen atom in each of these compounds. Here's a step-by-step breakdown:

### Step 1: Analyze Pyridine
- Pyridine has a nitrogen atom with a lone pair of electrons that is not involved in any resonance with the aromatic ring.
- This lone pair is available for donation, making pyridine a relatively strong base.

**Hint:** Look for the availability of the lone pair for donation in the structure of the compound.

...