Covalent is the type of bonding that involves electron sharing. In a double covalent bond, a carbon atom shares two pairs of electrons in two orbitals. Thus, option d is correct.
A double covalent bond is a type of covalent bond where the two pairs or four electrons are shared between the atoms of the molecules or compound. It results in the formation of a double bond.
The sharing of the two pairs of electrons resulting in a double bond is seen in ethene, carbon dioxide, etc. Here, the carbon atom shares its two electrons with two electrons of the other atomic element. The electrons are present in two orbits of the atom.
Therefore, option d. in a double covalent bond the two pairs of electrons in two orbitals are shared.
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