AIPMT PRELIMS2009Chemistry-Alcohols, Phenols, and Ethers
AIPMT PRELIMS 2009 Chemistry Reactions of Alcohols MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Consider the following reaction, ethanol PBr₃ ⟶ X alc. KOH ⟶ Y (i) H₂SO₄ room temperature (ii) H₂O, heat ⟶ Z; the product Z is:
A
CH₃CH₂−O−CH₂−CH₃
B
CH₃−CH₂−O−SO₃H
C
CH₃CH₂OH
D
CH₂=CH₂
Correct Answer
Option C
Detailed Explanation
The reaction sequence involves the conversion of ethanol to ethyl bromide using PBr₃, followed by elimination to form ethylene using alcoholic KOH. The ethylene reacts with H₂SO₄ to form ethyl hydrogen sulfate, which upon hydrolysis gives back ethanol.
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