List the following carbocations in the order of decreasing stability :
`CH_3 underset(underset(CI)|) CH CH_2 CH_(2)^(+) , CH_3 underset(underset(CH_3)|) CH CH_2 CH_(2)^(+), CH_3 CH_2 underset(underset(CI)|) CH CH_(2)^(+)`

Explanation

To determine the stability of the given carbocations, we will analyze each carbocation based on the substituents attached to the positively charged carbon atom. The stability of carbocations is influenced by the nature of the groups attached to them, particularly whether they are electron-donating or electron-withdrawing.

### Step-by-Step Solution:

1. **Identify the Carbocations**:
We have three carbocations to analyze:
- **Carbocation 1**: \( CH_3 \underset{(Cl)}{CH} CH_2 CH_2^{+} \)
- **Carbocation 2**: \( CH_3 \underset{(CH_3)}{CH} CH_2 CH_2^{+} \)
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