What happens when acetone reacts with hydrazine?

Acetone hydrazone is formed 

The correct answer is option 3. Acetone hydrazone is formed.

When acetone reacts with hydrazine (NH₂NH₂), the product formed is acetone hydrazone.

Here's the reaction for clarity:

In this reaction, acetone (CH₃COCH₃) reacts with hydrazine (NH₂NH₂) to form acetone hydrazone (CH₃C(=NNH₂)CH₃) and water. This process involves the condensation of acetone with hydrazine, where the carbonyl group of acetone (C=O) reacts with the hydrazine to form the hydrazone (C=NNH₂).