Which of the following compounds is/not oxidised by Fehling's solution?
a. Acetaldehyde
b. Phenylacetaldehyde
c. Benzaldehyde
d. p-Methyl benzaldehyde

Explanation

To determine which of the given compounds is not oxidized by Fehling's solution, we need to analyze each compound based on their structural characteristics and the nature of Fehling's solution.

### Step-by-Step Solution:

1. **Understanding Fehling's Solution**:
Fehling's solution is a chemical reagent used to test for the presence of aldehydes. It consists of a mixture of copper(II) sulfate (CuSO4) and Rochelle salt (sodium potassium tartrate). When an aldehyde is oxidized by Fehling's solution, it reduces the copper(II) ions (Cu²⁺) to copper(I) ions (Cu⁺), resulting in a reddish precipitate of copper(I) oxide (Cu2O).

2. **Analyzing the Compounds**:
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