Question

Which of the following reactions is preferentially used to prepare the corresponding paraffins from alkanone?

• A. Clemmensen reduction
• B. Etard reaction
• C. Rosenmund reduction
• D. Haloform reaction

Hint:

Clemmensen reduction uses Zn-Hg and conc. HCl to turn C=O into CH2.

Answer 1

The Correct Option is A

Step 1: Approach
Look at what each named reaction starts from and ends with.

Step 2: Named reactions
Clemmensen: ketone to alkane. Etard: toluene to benzaldehyde. Rosenmund: acid chloride to aldehyde. Haloform: methyl ketone to carboxylic acid salt and $\text{CHX}_3$.

Step 3: Conclusion
Only the Clemmensen reduction ends with a paraffin from a ketone, option (A).

Final Answer:
Zinc amalgam with concentrated HCl reduces the ketone to an alkane, option (A). \[ \boxed{\text{Clemmensen reduction}} \]