Question

Which does not form complex compounds?
A.N
B.P
C.As
D.Bi

Answer 1

Hint: We know that the complex compound can be described as a class of substances with a chemical structure where the central atom is a metal and it is surrounded by non-metal atoms or a group of atoms.

Complete answer:
Complex compound is a type of compound formed by the association between a central metal atom along with surrounding non-metal atoms or ions or ligands bonded by covalent, ionic or co-ordinate bonds.
Warner’s theory is used to describe the complex compound with their structure. Both the central atom and ligands are joined by chemical bonds like covalent bond, ionic bond, coordinate bond. Complex compound is also called a coordinate compound as it contains the coordinate bonds in its structure. Complex compounds show geometrical and optical isomerism.
The transition metals and their ions easily coordinate to a number of negative ions or neutral molecules having lone pairs of electrons to form complexes. The reason for this is the small size and high nuclear charge of these metals and availability of vacant d-orbitals of suitable energy to accommodate lone pairs of electrons donated by the ligands. Thus, only nitrogen doesn’t have any of the d orbitals whereas phosphorus, Arsenic and Bismuth which have d-orbitals.

Therefore, the correct answer is option A.

Note:
Remember that the Transition metals are also defined as the elements with partially filled d-subshell. Transition metals are small in size and have high positive charge density of ions and the central metal atom of a complex compound shows two types of valency primary and secondary.