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Which of the following compounds have a number of pπpπ bonds equal to pπdπ bonds.
(A) SO3
(B) SO2
(C) SOCl2
(D) SO2Cl2

Answer
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Hint: A covalent bond is a chemical bond formed by sharing of electron pairs. The sharing of electrons pairs is done by overlapping of orbitals and the side-to-side overlapping of p orbital with p orbital or p orbital with d orbital of two atoms gives pπpπ and pπdπ bonds. Sigma bonds are stronger than pi bonds.

Complete step by step answer:
Covalent bonds are chemical bonds which bond different atoms by sharing their electron pairs with each other. It is also known as molecular bonds. Pi bonds (π) are covalent bonds which are formed by the lateral overlapping of two lobes of an orbital of one atom on two lobes of an orbital of another atom. The bonded electrons by pi bond are called pi electrons. When the p orbital of one atom overlap side-to-side with the p orbital of another atom then this result in the formation of p π-p π bond, like C=O . Similarly when d orbital overlaps side-to-side with the p orbital they form ap π-d π bond.
So, (A) SO3 has sp2 hybridization and no lone pair.
The excited state of SO3 shows 2 electrons in d orbital and thus, those orbitals overlap with p orbital forming 2pπdπ bonds and 1pπpπ bond
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(B) SO2 has sp2 hybridization and one lone pair is present over sulphur
The excited state of SO2 show one electron in its d orbital which overlaps with the p orbital side-to-side and thus forms 1pπdπ bond and 1pπdπ
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(C) SOCl2 has S as a central atom with one lone pair double bonded oxygen atom and two chlorine atoms O=S . The double bond contains 1pπdπ bond.
Sulphur has a hybridization of [Ne]3s23p4:
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(D) SO2Cl2 has sulphur as their central atom which is double bonded with two oxygen atoms and single bonded with two chlorine atoms. It has a tetrahedral geometry and it is therefore sp3 hybridized. It forms only 2pπdπ bonds.

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Thus, (B) SO2 has 1pπdπ and 1pπpπ.


Note: Back bonding is a type of resonance showcased by many compounds which increases their stability. It affects the overall dipole moment and the hybridization of a compound. There are two types where one is central atom to side atom and the other is other atom to side atom.
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