Let us check each molecule
a) HCl : the number of shared electron pairs is "one"
the number of unshared electron pairs is six [on chlorine]
b) H₂S : the number of shared electron pairs is "two" as there are two bonds of sulphur with two hydrogen atoms.
The number of valence electrons on sulphur are six, out of these two are involved in bonding and rest four are in the form of two unshared (lone pair) pair of electrons
So in H₂S it has the same number of shared electron pairs as unshared electron pairs
c) PF₃ : the shared pair of electrons are "three"
the number of unshared electron pairs is one on phosphorous.
d) CCl₂F₂ : there are total four shared pair of electrons on carbon and zero unshared electron pairs
e) Br₂ : only one shared electron pair and three unshared electron pairs
The molecule that has the same number of shared electron pairs as unshared electron pairs is H2S.
In a molecule, chemical bonds are formed when atoms share electrons. However, some atoms have unshared electron pairs on their valence shells. These unshared electron pairs are called lone pairs and are localized on one of the atoms in the bond.
In the molecule H2S. There are two lone pairs or unshared pairs on sulfur and there are two shared pairs of electrons in the molecule. Hence the molecule that has the same number of shared electron pairs as unshared electron pairs is H2S.
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