NTA Abhyas JEE Main2020ChemistryAlcohols Phenols and EthersPractice
Dehydration of the following in increasing order is (I) (II) (III) (IV)
Options
- AI < II < III < IV
- BII < III < IV < I
- CI < III < IV < II
- DNone of these
Correct answer
A. I < II < III < IV
Step-by-step solution
Dehydration of IV is most facile since, it gives an aromatic compound. Dehydration of III gives a conjugated diene which is stabilized by resonance. Dehydration of II gives only cyclohexene which is not stabilized by resonance. In contrast, phenol (I) does not undergo dehydration. Thus, the ease of dehydration is IV > III > II > I.