Solution:
Concept- Although there are various sulphur allotropes, let's focus on its two most significant forms, yellow rhombic ( -sulphur) and monoclinic ( -sulphur). The allotropes of sulphur may be converted into one another, for example, rhombic sulphur turns into monoclinic sulphur when heated over 369k.In the cycle molecule of rhombic sulphur, all the S-S or sulphur- sulphur bond length is 204 pm, the length is 204pm between two sulphur atoms of sulphur.
Hence, the correct answer is 1.
