`{:(,"Column-I",,"Column-II"),((A),E_(1)cb,(p),"First order"),((B),S_(N)2,(q),"No rearrangement"),((C),E_(1),(r),"Rearragnement"),((D),S_(N)1,(s),"Strong nucleophile"),(,,(t),"Inversion of configuration"):}`

Answer

To solve the problem, we need to match the reactions in Column-I with the corresponding statements in Column-II based on the characteristics of each reaction type. Let's analyze each reaction type step by step.

### Step 1: Analyze E1CB
- **Reaction Type**: E1CB (Elimination Unimolecular Conjugate Base)
- **Characteristics**:
- It is a first-order reaction because the rate depends only on the concentration of the conjugate base.
- There is no rearrangement because the reaction involves the formation of an anion, which does not rearrange.
- A strong nucleophile is not required; a base is sufficient.
- There is no inversion of configuration.

**Match**: A → (p) "First order", (q) "No rearrangement"

### Step 2: Analyze SN2
- **Reaction Type**: SN2 (Bimolecular Nucleophilic Substitution)
- **Characteristics**:
- It is a second-order reaction because the rate depends on both the nucleophile and the substrate.
- There is no rearrangement in this reaction.
- A strong nucleophile is required for the reaction to occur.
- The reaction involves inversion of configuration due to the backside attack of the nucleophile.

**Match**: B → (t) "Inversion of configuration", (s) "Strong nucleophile"

### Step 3: Analyze E1
- **Reaction Type**: E1 (Unimolecular Elimination)
- **Characteristics**:
- It is a first-order reaction because the rate depends on the formation of the carbocation.
- There is a possibility of rearrangement due to the formation of a carbocation, which can rearrange to a more stable form.

**Match**: C → (p) "First order", (r) "Rearrangement"

### Step 4: Analyze SN1
- **Reaction Type**: SN1 (Unimolecular Nucleophilic Substitution)
- **Characteristics**:
- It is a first-order reaction because the rate depends on the formation of the carbocation.
- There is rearrangement due to the stability of the carbocation.
- The reaction can lead to a racemic mixture because the nucleophile can attack from either side of the planar carbocation.

**Match**: D → (q) "No rearrangement", (r) "Rearrangement"

### Final Matching
- A → (p) "First order"
- B → (t) "Inversion of configuration"
- C → (r) "Rearrangement"
- D → (q) "No rearrangement"

### Summary of Matches
- A: E1CB - (p) "First order", (q) "No rearrangement"
- B: SN2 - (t) "Inversion of configuration", (s) "Strong nucleophile"
- C: E1 - (p) "First order", (r) "Rearrangement"
- D: SN1 - (q) "No rearrangement", (r) "Rearrangement"