Ketones can be formed from which of the following reactions Reduction of esters with DIBALAll of theseNone of theseOxidation of a

Analysis of Each Option

• Reduction of esters with DIBAL (Diisobutylaluminum hydride):
  DIBAL can selectively reduce esters to aldehydes at low temperatures. However, with **excess** DIBAL or under modified conditions, esters may be reduced only partially, especially in bulky systems, yielding **ketones** in rare controlled cases.
  ✔ May produce ketones under specific conditions
• Oxidation of a primary alcohol using KMnO₄:
  KMnO₄ is a strong oxidizing agent and will oxidize primary alcohols all the way to **carboxylic acids**.
  ✘ Does not yield ketones
• Oxidation of a primary alcohol using PCC (Pyridinium chlorochromate):
  PCC is a mild oxidizer, converting primary alcohols to **aldehydes**, not ketones.
  ✘ Does not yield ketones
• Oxidation of a secondary alcohol:
  This is not listed, but worth noting: **secondary alcohols** are typically oxidized to **ketones** using either PCC or KMnO₄.

Final Evaluation

The only valid reaction among the listed choices that can yield a ketone—under controlled conditions—is:

Therefore, the correct answer is: