Question

The odd one is:
(Note: Valency is not a criterion)
A. Iodine
B. Sulphur
C. Phosphorus
D. Carbon

Answer 1

There exists one element among them which is not having some kind of chemical bond which is not shown by others. Catenation is one of the properties which differentiate one element.

Complete Step By Step Solution:
Catenation: The property of element due to which it forms covalent bonds with other atoms of the same element to form a chain of atoms is called catenation.
Catenation occurs only among the atoms of an element that has a valency of at least two and that forms relatively strong bonds with itself. The property is predominant among carbon atoms, significant among sulfur and silicon atoms, and slightly present among germanium, nitrogen, selenium, and tellurium atoms. So in this case catenation is shown by each sulphur, phosphorus and carbon apart from iodine. So iodine is added to one of them.

**So the correct option is A. Iodine

Note: **
Catenation occurs most easily in carbon, forming covalent bonds to form longer chains and structures with other carbon atoms. That is why the vast number of organic compounds is found in nature. Carbon is best known for its catenation properties.