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p-p overlapping will be observed in the molecule of
A. Hydrogen
B. Hydrogen bromide
C. Hydrogen chloride.
D. Chlorine.

Answer
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Hint: p-p overlapping in the simplest term can be defined as the penetration of the electron cloud of the p orbitals of the two atoms. So, we can say that p-p overlapping will be only possible in those molecules in which each atom must have at least one partially filled p orbital in it.

Complete step-by-step answer:To answer this type of question, we will see the atomic orbitals involved in the bonding in each molecule. For p-p overlapping in a binary molecule, both atoms should involve p atomic orbitals overlapping.
In other words, if in a binary molecule if even one atom will not have electrons in p atomic orbital then the p-p overlapping is not possible.
Now we will see option by option the molecules.
In the Option A. we are given with a hydrogen molecule (H2). This molecule is formed by the overlapping of atomic orbitals of two hydrogen atoms. We know the electronic configuration of hydrogen is 1s2. There are two electrons in s orbitals only and p orbitals have no electrons. hence, there will be s-s overlapping in the hydrogen molecule.
In the Option B. hydrogen bromide (HBr) molecule is given. We know that the electronic configuration of bromine is [Ar]4s23d104p5. This means there are electrons in p orbitals present which can participate in overlapping. But hydrogen has no p orbitals, it has only s orbitals. So, there will be s-p overlapping and not p-p.
In the Option C. we are given with hydrogen chloride (HCl). we know the electronic configuration of chlorine is 1s22s22p63s23p5. This shows that there are electrons in p orbitals in chlorine. But again, we know that hydrogen has electrons only in s orbital. Therefore, here also the overlapping will be s-p
In the Option D. we are given a chlorine molecule (Cl2). We know that chlorine molecules are formed by the combination of two chlorine atoms. We also know that the configuration of chlorine is 1s22s22p63s23p5. Since, both atoms are chlorine. So, we can say that there will be p-p overlapping in the chlorine molecule.

Hence, option (D) is the correct option.

Note: p-p overlapping can be of two types. One head-on overlapping and another side wise overlapping. In head-on overlapping a sigma bond is formed whereas in sidewise overlapping of p-orbital a pi bond is formed. But always remember that a pi bond is only formed after there is at least one sigma bond in the compound.