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JEE Main levelSingle correct optionDifficulty 2 of 3pn077

Rhombic sulphur changes into monoclinic sulphur on heating above 369 K. Which statement about the two forms is correct?

  1. ABoth contain crown-shaped rings and differ in the way the rings are packed in the crystal
  2. BMonoclinic sulphur is a chain polymer
  3. CMonoclinic sulphur contains rings while rhombic sulphur contains rings
  4. DRhombic sulphur is stable above 369 K and monoclinic below it

Answer: A

Both allotropes are built from puckered rings; they differ only in crystal packing. At 369 K the stability order switches: rhombic is stable below it and monoclinic above it.
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