p-Cresol is **4-methylphenol**. When it is heated with **zinc dust**, the **–OH group is removed** by reduction, forming the corresponding **hydrocarbon**.
- Removing –OH from 4-methylphenol yields **1,4-dimethylbenzene**, which is **p-xylene**.
- Zinc dust is a common reagent for **reducing phenols to arenes**.
Hence, the major product is **p-xylene**.