Assertion: Aldehydes and ketones, both react with tollens' reagent to form silver mirror.
Reason: Both, aldehydes and ketones contain a carbonyl group.

Options

A. Assertion and reason both are correct and reason is correct explanation of assertion.
B. Assertion and reason both are wrong statement.
C. Assertion is correct statement but reason is wrong statement.
D. Assertion is wrong statement but reason is correct statement.

Explanation

To solve the question, we need to analyze the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that both aldehydes and ketones react with Tollens' reagent to form a silver mirror.

- **Analysis**: This statement is **false**. Tollens' reagent (Ag(NH3)2+) is known to react primarily with aldehydes, not ketones. Aldehydes can be oxidized to carboxylic acids, while ketones generally do not undergo this reaction because they lack the necessary hydrogen atom (aldehydic hydrogen) that is present in aldehydes.

### Step 2: Understand the Reason
The reason states that both aldehydes and ketones contain a carbonyl group.

- **Analysis**: This statement is **true**. Both aldehydes (RCHO) and ketones (R2C=O) indeed contain a carbonyl group (C=O). However, the presence of a carbonyl group alone does not determine the reactivity with Tollens' reagent.

### Step 3: Conclusion
Since the assertion is false and the reason is true, we can conclude that the correct answer is that the assertion is false while the reason is true.

### Final Answer
- **Assertion**: False
- **Reason**: True