Chemistry - ALCOHOL & ETHER Question with Solution | TestHub
Answer the following by appropriately matching the lists based on the information given in the paragraph.
1° alcohol on oxidation by mild oxidising agent produces aldehyde while with strong oxidising agent
carboxylic acid is obtained. On the other hand 2° alcohol with mild oxidising agent gives ketone. 3° alcohol is reluctant to oxidation by mild oxidising agents.
List - I (Reaction) | List - II (Reagents) |
|---|---|
(P)
| (1) PCC, CH2Cl2 |
(Q)
| (2) KMnO4 / H+ |
(R)
| (3) Collin's Reagent |
(S)
| (4) |
| (5) |
Correctly matched away the following is :
Options:
Answer:
Solution:
Question Explanation:
Match the specific structural transformations of alcohols to the most appropriate selective reagents.
Concept: This question is based on Selective Oxidation and Allylic Oxidation.
Solution:
PCC (Pyridinium chlorochromate) and Collin’s reagent are mild oxidizing agents.
They oxidize 1° alcohols → aldehydes and 2° alcohols → ketones, without further oxidation.
KMnO₄/H⁺ and K₂Cr₂O₇/H⁺ are strong oxidizing agents.
They oxidize 1° alcohols → carboxylic acids and 2° alcohols → ketones.
On heating with Cu at 573 K:
1° alcohols → aldehydes,
2° alcohols → ketones,
3° alcohols → alkenes (via dehydration).
Allylic alcohols (II) are selectively oxidized to enones by MnO₂.
Final Answer: Option (d)
