Question

Which of the following reagents forms semicarbazone when treated with ketones?

• A. Hydroxyl amine
• B. Hydrazine
• C. Phenyl hydrazine
• D. Semicarbazide

Hint:

Each nitrogen reagent gives its own derivative; semicarbazide gives semicarbazone.

Answer 1

The Correct Option is D

Step 1: Name Pattern
The derivative takes its name from the reagent: semicarbazide leads to semicarbazone.

Step 2: Eliminate
The other three give oxime, hydrazone and phenylhydrazone.

Step 3: Result
Option (D) is correct.

Final Answer:
The reagent named semicarbazide gives the semicarbazone. \[ \boxed{\text{(D) }\text{Semicarbazide}} \]