Which of the following is not a property of \(\alpha\)- sulphur?

It has monoclinic structure

The correct answer is 2. It has monoclinic structure.

\(\alpha \)-sulphur has a rhombic structure, not a monoclinic structure.

\(\alpha \)-sulphur, also known as rhombic sulphur, is the most common allotrope of sulphur. It is a yellow, crystalline solid with a rhombic crystal structure. It is readily soluble in carbon disulphide \((CS_2)\) and has a melting point of 385.8 K.

Monoclinic sulphur, also known as \(\beta \)-sulphur, is another allotrope of sulphur. It has a monoclinic crystal structure and is less stable than \(\alpha \)-sulphur. It is not as readily soluble in \(CS_2\) and has a melting point of 393 K.

The following table summarizes the key properties of α-sulfur and β-sulfur: