Two unlabelled bottles contain ethane and ethene separately. Describe two chemical tests to identify the gases.

Explanation

To identify the gases ethane and ethene in two unlabelled bottles, we can perform the following two chemical tests:

### Test 1: Bromine Water Test
1. **Procedure**: Add a few drops of bromine solution in carbon tetrachloride to the gas in the bottle.
2. **Observation**:
- **For Ethane**: No change is observed; the reddish-brown color of bromine remains.
- **For Ethene**: The reddish-brown color of bromine is decolorized.

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