Match the Column-I with Column-II:
`{:(,"Column-I",,"Column-II"),((A),E_(1),(p),"Carbocations"),((B),E_(2),(q),"Strong nucleophile"),((C),S_(N)1,(r),"Reactivity of a alkyl halides" 1^(@)gt2^(@)gt3^(@)),((D),S_(N)2,(s),TS),(,,(t),"Reactivity of alkyl halides" 3^(@)gt2^(@)gt1^(@)):}`

Explanation

To solve the problem of matching Column-I with Column-II, we will analyze each item in Column-I (which includes E1, E2, SN1, and SN2) and find the corresponding match in Column-II (which includes carbocations, strong nucleophiles, reactivity of alkyl halides, and transition states).

### Step-by-Step Solution:

1. **Identify E1:**
- E1 is an elimination reaction that occurs in two steps. The first step involves the formation of a carbocation, which is the rate-determining step.
- **Match:** E1 (A) matches with "Carbocations" (P).

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