NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Chemistry
- Chapter
- Chapter
NEET 2026 · Chemistry · Chapter
Consider the chemical reaction shown in the given figure. Which of...
Consider the chemical reaction shown in the given figure.
Which of the following correctly identifies the major products P and Q?
Options
- AIodobenzene and tert-butyl alcohol
- BPhenol and tert-butyl iodide
- CPhenol and isobutyl iodide
- DIodobenzene and isobutyl alcohol
Correct answer
B. Phenol and tert-butyl iodide
Step-by-step solution
The given reaction is the cleavage of tert-butyl phenyl ether by hydroiodic acid (HI).
First, the ether oxygen is protonated by HI to form an oxonium ion.
The cleavage of the C-O bond can occur in two ways. However, the C-O bond between the phenyl ring and the oxygen atom has partial double bond character due to resonance, making it stronger and difficult to break. Furthermore, cleavage of the C-O bond between the tert-butyl group and the oxygen atom results in the formation of a highly stable tert-butyl carbocation via an mechanism.
Therefore, the bond breaks to yield phenol and a tert-butyl carbocation.
The tert-butyl carbocation is then attacked by the iodide ion () to form tert-butyl iodide.
Thus, the major products P and Q are phenol and tert-butyl iodide.
Answer: Phenol and tert-butyl iodide
First, the ether oxygen is protonated by HI to form an oxonium ion.
The cleavage of the C-O bond can occur in two ways. However, the C-O bond between the phenyl ring and the oxygen atom has partial double bond character due to resonance, making it stronger and difficult to break. Furthermore, cleavage of the C-O bond between the tert-butyl group and the oxygen atom results in the formation of a highly stable tert-butyl carbocation via an mechanism.
Therefore, the bond breaks to yield phenol and a tert-butyl carbocation.
The tert-butyl carbocation is then attacked by the iodide ion () to form tert-butyl iodide.
Thus, the major products P and Q are phenol and tert-butyl iodide.
Answer: Phenol and tert-butyl iodide