The stability towards dehydration of the following compound

decreases in the order

Answer

B

Explanation

Since phenol (I) is a stable aromatic compound, therefore, it is the most stable towards dehydration. The diene (II) undergoes dehydration more readily because on dehyration, it gives stable phenol. The alkene (III) undergoes dehydration less readily because on dehydration, it gives a more stable diene while alcohol (IV) undergoes dehydration least readily because on dehydration, it gives only a less stable alkene. thus, the stability towards dehydration decreases in the order:
IgtIVgtIIIgtII.