Which molecule contains both polar and nonpolar covalent bond?
A
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B
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C
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D
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Solution
The correct option is B
Explanation for correct option
(b)
In this compound, oxygen is more electronegative than hydrogen.
Hence, oxygen pulls the shared pair of electrons towards itself and because of this, oxygen has partial negative and hydrogen has partial positive charge in their two bonds.
Whereas in bond, the electronegativity is same and thus there is equal attraction of share pair of electrons on both sides.
Hence, bond is polar and bond is non polar,
Therefore, the correct option is (b) .
Explanation for incorrect options
(a)
Bromine is more electronegative than hydrogen.
This will result in partial negative charge on bromine since it will attract the shared pair of electrons towards itself.
Hydrogen will have a partial positive charge.
will be a polar compound having dipole moment towards bromine.
Hence, (a) is the incorrect option.
(c)
In this molecule, does not have much electronegativity difference.
And hydrogen also evenly surrounds carbon cancelling all the poles against each other.
Therefore, is a non- polar molecule.
Hence, (c) is the incorrect option.
(d)
has unequal electronegativity.
This results in non- uniform distribution of charge across them.