A natural compound (A) `(C_(7)H_(6)O)` forms an oxime. When (A) is treated with acetic anhydride and sodium acetate, it yields a product (B) which decolourises alkaline `KMnO_(4)` solution and also gives effervscence with `NaHCO_(3)`. Explain the reaction and assign structures to (A) and (B).

Explanation

To solve the problem step by step, we will identify the natural compound (A) with the formula \( C_7H_6O \), determine its structure, and then analyze the reaction with acetic anhydride and sodium acetate to find the product (B).

### Step 1: Determine the structure of compound (A)

1. **Calculate the degree of unsaturation**:
The formula for degree of unsaturation (DU) is:
\[
DU = \frac{2C + 2 - H}{2}
...