Answer : The correct option is, (A) [tex]NO_2[/tex]
Explanation :
Ionic bond : It is defined as the bond which is formed by complete transfer of electrons from one atom to another atom.
The ionic compound is formed between a metal and a non-metal.
Covalent bond : It is defined as the bond that is formed when sharing of electrons takes place between the atoms.
The covalent compound is formed between two non-metals.
(a) [tex]NO_2[/tex]
It is a covalent compound in which nitrogen and oxygen are non-metals. The [tex]NO_2[/tex] is formed when one nitrogen atom share their electrons with two oxygen atoms.
(b) [tex]LiCl[/tex]
It is an ionic compound in which lithium is a metal and chlorine is a non-metal. The [tex]LiCl[/tex] is formed by the complete transfer of electrons.
(c) [tex]AlCl_3[/tex]
It is an ionic compound in which aluminum is a metal and chlorine is a non-metal. The [tex]AlCl_3[/tex] is formed by the complete transfer of electrons.
(d) [tex]Na_2S[/tex]
It is an ionic compound in which sodium is a metal and sulfur is a non-metal. The [tex]Na_2S[/tex] is formed by the complete transfer of electrons.
Hence, the covalent compound is [tex]NO_2[/tex]
