Q.The formula of sulphur molecule is

The common allotropes of sulphur (rhombic and monoclinic) consist of S8 molecules arranged as a puckered, crown-shaped eight-membered ring.

Sulphur exhibits catenation and forms rings of various sizes, but the thermodynamically stable forms at room temperature - rhombic ($\alpha$-sulphur) and monoclinic ($\beta$-sulphur) - are both built from S8 units, each a non-planar 'crown' ring held together by single S-S covalent bonds. On heating or in certain solvents, sulphur can also form S6, S4, and chain (catena) forms, but the standard/default molecular formula for sulphur is S8.

…