BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which molecule has a polar covalent bond?
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H-F
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K-F
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Na-F
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Detailed explanation-1: -Hydrogen fluoride (HF) is another example of a molecule that has a polar covalent bond. Fluorine is the more electronegative atom, so the electrons in the bond are more closely associated with the fluorine atom than with the hydrogen atom.
Detailed explanation-2: -In a hydrogen fluoride (HF) molecule, a hydrogen atom and a fluorine atom are held together by a polar covalent bond.
Detailed explanation-3: -Hydrogen fluoride (HF) is a very polar molecule due to the large difference in electronegativity of hydrogen and fluorine atoms. This results in an induced positive charge on the hydrogen atom and a negative charge on the fluorine atom, creating a net dipole moment.
Detailed explanation-4: -The above discussion suggests that the highest electronegative difference is in the HF molecule, which is 1.78. Therefore the bond between H-F is most polar.
Detailed explanation-5: -HF is more polar than HCl. Fluorine is more electronegative than chlorine. Hence, The polarity is maximum in HF.