Compound X having the molecular formula C₆H₆O is heated with concentrated H₂SO₄ at 373 K to yield compound Y as the major product. Compound Y is then heated with concentrated HNO₃ to produce a yellow-coloured strong acid, compound Z . The total number of sigma ( ) bonds present in one molecule of compound Z is

Step-by-step solution

Compound X ( C₆H₆O ) is phenol. When phenol is heated with concentrated H₂SO₄ at 373 K , the major product formed is para-phenolsulphonic acid (compound Y ), due to thermodynamic control at higher temperatures. Heating compound Y with concentrated HNO₃ is the standard industrial method for preparing 2,4,6-trinitrophenol, commonly known as picric acid (compound Z ). Picric acid is a yellow-coloured strong acid. The structure of picric acid is C₆H₂(OH)(NO₂)₃ . Let us count the sigma ( ) bonds in one molecule: 1. Benz