Aldehydes are easily oxidisable yet propanal can conveniently br prepared by the oxidation of propanol by acid `K_(2)Cr_(2)O_(7)`.

Explanation

To solve the question regarding the oxidation of propanol to propanal using potassium dichromate (K2Cr2O7) and why this process is feasible despite aldehydes being easily oxidizable, we can break it down into the following steps:

### Step 1: Understand the Oxidation Process
Propanol (an alcohol) can be oxidized to propanal (an aldehyde) using an oxidizing agent such as K2Cr2O7 in acidic conditions. The reaction can be represented as:
\[ \text{CH}_3\text{CH}_2\text{CH}_2\text{OH} \xrightarrow{\text{K}_2\text{Cr}_2\text{O}_7, \text{H}^+} \text{CH}_3\text{CH}_2\text{CHO} + \text{H}_2\text{O} \]

### Step 2: Characteristics of Aldehydes
Aldehydes, including propanal, are known to be easily oxidizable to carboxylic acids. However, propanal has a boiling point lower than 373 K (100 °C). This property is crucial for the reaction.
...