Question

Identify the product when a ketone reacts with hydrazine $(NH_2-NH_2)$

• A. Oxime
• B. Hydrazone
• C. Semicarbazone
• D. Phenylhydrazone

Hint:

Important carbonyl derivatives formed with ammonia derivatives:

• Hydroxylamine \(\rightarrow\) Oxime
• Hydrazine \(\rightarrow\) Hydrazone
• Semicarbazide \(\rightarrow\) Semicarbazone
• 2,4-DNP \(\rightarrow\) 2,4-DNP derivative (orange precipitate)

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks for the product formed by the nucleophilic addition-elimination reaction of a ketone with hydrazine.
Step 2: Detailed Explanation:
Ketones react with ammonia derivatives $(NH_2-G)$ to form compounds with a $C=N-G$ linkage and a water molecule is eliminated.
Reaction: $R_2C=O + H_2N-NH_2 \xrightarrow{H^+} R_2C=N-NH_2 + H_2O$
When $G = -NH_2$ (hydrazine), the product is called a hydrazone.
Step 3: Final Answer:
The product is hydrazone.