Describe the following
i. Acetylation
ii. Cannizzaro reaction
iii. Cross aldol condensation
iv. Decarboxylation

Explanation

### Step-by-Step Text Solution

#### i. Acetylation
Acetylation is a chemical reaction that introduces an acetyl group (−COCH₃) into a molecule. This process typically involves the reaction of an organic compound with acetyl chloride (or acetic anhydride) in the presence of a Lewis acid catalyst, such as aluminum chloride (AlCl₃).

**Example:**
When benzene reacts with acetyl chloride in the presence of AlCl₃, it undergoes electrophilic substitution to form acetophenone (C₆H₅COCH₃) and hydrochloric acid (HCl) as a byproduct.

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