Answer : The correct Lewis structure is shown below.
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The representation of valence electrons of an atom by dots around the symbol of an element is said to be the Lewis-dot symbol.
In the representation of Lewis-symbol, one electron dot must put on each side of the element symbol then paired the electrons.
(a) The given molecule is, [tex]NH_3[/tex]
As we know that nitrogen has '5' valence electrons and hydrogen has '1' valence electrons.
Therefore, the total number of valence electrons in [tex]NH_3[/tex] = 5 + 3(1) = 8
According to Lewis-dot structure, there are 6 number of bonding electrons and 2 number of non-bonding electrons.
(b) The given molecule is, [tex]OCl_2[/tex]
As we know that oxygen has '6' valence electrons and chlorine has '7' valence electrons.
Therefore, the total number of valence electrons in [tex]OCl_2[/tex] = 6 + 2(7) = 20
According to Lewis-dot structure, there are 8 number of bonding electrons and 12 number of non-bonding electrons.
(c) The given molecule is, [tex]HCOOH[/tex]
As we know that carbon has '4' valence electrons, oxygen has '6' valence electrons and hydrogen has '1' valence electrons.
Therefore, the total number of valence electrons in [tex]HCOOH[/tex] = 4 + 2(1) + 2(6) = 18
According to Lewis-dot structure, there are 10 number of bonding electrons and 8 number of non-bonding electrons.
(d) The given molecule is, [tex]HBr[/tex]
As we know that bromine has '7' valence electrons and hydrogen has '1' valence electrons.
Therefore, the total number of valence electrons in [tex]HBr[/tex] = 1 + 7 = 8
According to Lewis-dot structure, there are 2 number of bonding electrons and 6 number of non-bonding electrons.
