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STD 12 - 7. Alcohol, phenol and ethers — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 7. Alcohol, phenol and ethers4 Marks
MCQ
Assertion : Ethyl phenyl ether on reaction with $HBr$ form phenol and ethyl bromide.
Reason : Cleavage of $C-O$ bond takes place on ethyl-oxygen bond due to the more stable phenyl-oxygen bond
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
Alkyl aryl ether are cleaved at the alkyl-oxygen bond due to the more stable aryl - oxygen bond. The reaction yields phenol and alkyl halide

Ether with two different alkyl groups are also cleaved in the same manner.

$R-O-R '+HX\to R-X+R'-OH$

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