Given below are two statements:
Statement I: $$\alpha$$ and $$\beta$$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.
Statement II: At room temperature the stable crystalline form of sulphur is monoclinic sulphur.
In the light of the above statements, choose the correct answer from the options given below:

We need to evaluate both statements about sulphur allotropes.

Statement I says that the $$\alpha$$ (rhombic) and $$\beta$$ (monoclinic) forms of sulphur can change reversibly between themselves with slow heating or slow cooling. This is correct. At the transition temperature of 95.6°C, rhombic sulphur slowly converts to monoclinic sulphur on heating, and monoclinic sulphur converts back to rhombic sulphur on slow cooling. This reversible interconversion is a well-known example of allotropy.

Statement II says that at room temperature the stable crystalline form of sulphur is monoclinic sulphur. This is false. At room temperature (below 95.6°C), the thermodynamically stable form of sulphur is rhombic sulphur ($$\alpha$$-sulphur), not monoclinic sulphur. Monoclinic sulphur is stable only between 95.6°C and 119°C.

Therefore, Statement I is true but Statement II is false, which corresponds to option (2).