Question

Which of the following compounds is most reactive towards nucleophilic addition reaction?

• A.

  

• B.

  

• C. \(\text{C}_{2}\text{H}_{5}\text{-CO-H}\)
• D. \(\text{C}_{2}\text{H}_{5}\text{-CO-C}_{2}\text{H}_{5}\)

Hint:

Aliphatic aldehydes are more reactive than aromatic aldehydes and ketones.

Answer 1

The Correct Option is C

Step 1: Rank classes
Aliphatic aldehyde $\gt$ aromatic aldehyde $\gt$ ketones.

Step 2: Apply
Propanal is the aliphatic aldehyde, benzaldehyde is aromatic, and the other two are ketones.

Step 3: Conclusion
So propanal is the most reactive.

Final Answer:
The aliphatic aldehyde propanal is the answer. \[ \boxed{\text{(C) }\text{C}_{2}\text{H}_{5}\text{-CO-H}} \]