The major product obtained in the reaction of aniline with acetic anhydride is

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Explanation

To determine the major product obtained from the reaction of aniline with acetic anhydride, we can follow these steps:

### Step 1: Identify the Reactants
- Aniline (C6H5NH2) is an aromatic amine with an amino group (-NH2) attached to a benzene ring.
- Acetic anhydride (C4H6O3) is a reagent that can react with nucleophiles.

### Step 2: Understand the Reaction Mechanism
- The lone pair of electrons on the nitrogen atom of the aniline will act as a nucleophile and attack the carbonyl carbon of the acetic anhydride.

### Step 3: Form the Intermediate
- When the nitrogen attacks the carbonyl carbon, the acetic anhydride will break down, leading to the formation of an intermediate. The structure of the intermediate can be represented as:
\[ \text{C6H5-NH-CO-CH3} \]
This structure shows that the nitrogen is now bonded to a carbonyl group (C=O) and a methyl group (CH3).

### Step 4: Elimination of a Leaving Group
- The intermediate will undergo a rearrangement where a hydrogen atom from the nitrogen will be released as a proton (H+), and the bond between the oxygen and the carbonyl will stabilize, resulting in the formation of the final product.

### Step 5: Write the Final Product
- The final product of this reaction will be N-phenylacetamide, which can be represented as:
\[ \text{C6H5-NH-CO-CH3} \]
or simply as:
\[ \text{N-phenylacetamide} \]

### Conclusion
The major product obtained from the reaction of aniline with acetic anhydride is N-phenylacetamide.