BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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and (2) only
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and (3) only
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and (3) only
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, (2) and (3)
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Detailed explanation-1: -Electron pairs shared between atoms of equal or very similar electronegativity constitute a nonpolar covalent bond (e.g., H–H or C–H), while electrons shared between atoms of unequal electronegativity constitute a polar covalent bond (e.g., H–O).
Detailed explanation-2: -Both CO2 and H2O have two polar bonds. However the dipoles in the linear CO2 molecule cancel each other out, meaning that the CO2 molecule is non-polar. The polar bonds in the bent H2O molecule result in a net dipole moment, so H2O is polar.
Detailed explanation-3: -Hydrogen chloride is a diatomic molecule consisting of H atom and Cl atom connected by a covalent single bond. Since the Cl atom is much more electronegative than the hydrogen atom, the covalent bond between two atoms is quite polar.