Give simple chemical tests to distinguish between the following pairs of compounds:
Propanal and diethyl ether.

Explanation

To distinguish between propanal (an aldehyde) and diethyl ether (an ether), we can use the Tollens' test, which is a simple chemical test. Here’s a step-by-step solution:

### Step 1: Understand the Compounds
- **Propanal (CH₃CH₂CHO)**: This is an aldehyde.
- **Diethyl Ether (C₂H₅OC₂H₅)**: This is an ether.

### Step 2: Prepare the Tollens' Reagent
- Tollens' reagent is prepared by mixing silver nitrate (AgNO₃) with ammonia (NH₃) to form a complex, Ag(NH₃)₂⁺.
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